diff --git a/analytics-next/package.json b/analytics-next/package.json
index 0fb07418..ee4e36ff 100644
--- a/analytics-next/package.json
+++ b/analytics-next/package.json
@@ -6,6 +6,6 @@
   },
   "license": "Apache-2.0",
   "dependencies": {
-    "firebase": "^9.12.1"
+    "firebase": "^10.0.0"
   }
 }
diff --git a/appcheck-next/package.json b/appcheck-next/package.json
index ad78db9f..e863723e 100644
--- a/appcheck-next/package.json
+++ b/appcheck-next/package.json
@@ -6,6 +6,6 @@
   },
   "license": "Apache-2.0",
   "dependencies": {
-    "firebase": "^9.12.1"
+    "firebase": "^10.0.0"
   }
 }
diff --git a/auth-next/apple.js b/auth-next/apple.js
index f9670b4c..2777a085 100644
--- a/auth-next/apple.js
+++ b/auth-next/apple.js
@@ -38,6 +38,7 @@ function appleSignInPopup(provider) {
       const accessToken = credential.accessToken;
       const idToken = credential.idToken;
 
+      // IdP data available using getAdditionalUserInfo(result)
       // ...
     })
     .catch((error) => {
diff --git a/auth-next/custom-email-handler.js b/auth-next/custom-email-handler.js
index 728baff8..5fcc1f71 100644
--- a/auth-next/custom-email-handler.js
+++ b/auth-next/custom-email-handler.js
@@ -28,8 +28,8 @@ function handleUserManagementQueryParams() {
     // Configure the Firebase SDK.
     // This is the minimum configuration required for the API to be used.
     const config = {
-      'apiKey': "YOU_API_KEY" // Copy this key from the web initialization
-                              // snippet found in the Firebase console.
+      'apiKey': "YOUR_API_KEY" // Copy this key from the web initialization
+                               // snippet found in the Firebase console.
     };
     const app = initializeApp(config);
     const auth = getAuth(app);
diff --git a/auth-next/email-link-auth.js b/auth-next/email-link-auth.js
index 59ea2115..fde67663 100644
--- a/auth-next/email-link-auth.js
+++ b/auth-next/email-link-auth.js
@@ -19,7 +19,8 @@ function emailLinkActionCodeSettings() {
       installApp: true,
       minimumVersion: '12'
     },
-    dynamicLinkDomain: 'example.page.link'
+    // The domain must be configured in Firebase Hosting and owned by the project.
+    linkDomain: 'custom-domain.com'
   };
   // [END auth_email_link_actioncode_settings]
 }
@@ -68,11 +69,13 @@ function emailLinkComplete() {
       .then((result) => {
         // Clear email from storage.
         window.localStorage.removeItem('emailForSignIn');
-        // You can access the new user via result.user
-        // Additional user info profile not available via:
-        // result.additionalUserInfo.profile == null
+        // You can access the new user by importing getAdditionalUserInfo
+        // and calling it with result:
+        // getAdditionalUserInfo(result)
+        // You can access the user's profile via:
+        // getAdditionalUserInfo(result)?.profile
         // You can check if the user is new or existing:
-        // result.additionalUserInfo.isNewUser
+        // getAdditionalUserInfo(result)?.isNewUser
       })
       .catch((error) => {
         // Some error occurred, you can inspect the code: error.code
diff --git a/auth-next/email.js b/auth-next/email.js
index b00551c8..26391f81 100644
--- a/auth-next/email.js
+++ b/auth-next/email.js
@@ -32,7 +32,7 @@ function signUpWithEmailPassword() {
   const auth = getAuth();
   createUserWithEmailAndPassword(auth, email, password)
     .then((userCredential) => {
-      // Signed in 
+      // Signed up 
       const user = userCredential.user;
       // ...
     })
diff --git a/auth-next/emulator-suite.js b/auth-next/emulator-suite.js
index 66507de3..13b1ba95 100644
--- a/auth-next/emulator-suite.js
+++ b/auth-next/emulator-suite.js
@@ -6,7 +6,7 @@ function emulatorConnect() {
   const { getAuth, connectAuthEmulator } = require("firebase/auth");
 
   const auth = getAuth();
-  connectAuthEmulator(auth, "http://localhost:9099");
+  connectAuthEmulator(auth, "http://127.0.0.1:9099");
   // [END auth_emulator_connect]
 }
 
diff --git a/auth-next/facebook.js b/auth-next/facebook.js
index 67b397f2..3c6feb8a 100644
--- a/auth-next/facebook.js
+++ b/auth-next/facebook.js
@@ -33,6 +33,7 @@ function facebookSignInPopup(provider) {
       const credential = FacebookAuthProvider.credentialFromResult(result);
       const accessToken = credential.accessToken;
 
+      // IdP data available using getAdditionalUserInfo(result)
       // ...
     })
     .catch((error) => {
@@ -61,6 +62,8 @@ function facebookSignInRedirectResult() {
       const token = credential.accessToken;
 
       const user = result.user;
+      // IdP data available using getAdditionalUserInfo(result)
+      // ...
     }).catch((error) => {
       // Handle Errors here.
       const errorCode = error.code;
diff --git a/auth-next/github.js b/auth-next/github.js
index babfd1ee..4c128721 100644
--- a/auth-next/github.js
+++ b/auth-next/github.js
@@ -40,6 +40,7 @@ function githubSignInPopup(provider) {
 
       // The signed-in user info.
       const user = result.user;
+      // IdP data available using getAdditionalUserInfo(result)
       // ...
     }).catch((error) => {
       // Handle Errors here.
@@ -70,6 +71,8 @@ function githubSignInRedirectResult() {
 
       // The signed-in user info.
       const user = result.user;
+      // IdP data available using getAdditionalUserInfo(result)
+      // ...
     }).catch((error) => {
       // Handle Errors here.
       const errorCode = error.code;
diff --git a/auth-next/google-signin.js b/auth-next/google-signin.js
index 136c26b5..025eebd6 100644
--- a/auth-next/google-signin.js
+++ b/auth-next/google-signin.js
@@ -33,6 +33,7 @@ function googleSignInPopup(provider) {
       const token = credential.accessToken;
       // The signed-in user info.
       const user = result.user;
+      // IdP data available using getAdditionalUserInfo(result)
       // ...
     }).catch((error) => {
       // Handle Errors here.
@@ -60,6 +61,8 @@ function googleSignInRedirectResult() {
 
       // The signed-in user info.
       const user = result.user;
+      // IdP data available using getAdditionalUserInfo(result)
+      // ...
     }).catch((error) => {
       // Handle Errors here.
       const errorCode = error.code;
diff --git a/auth-next/index.js b/auth-next/index.js
index b4a17903..04ac7d03 100644
--- a/auth-next/index.js
+++ b/auth-next/index.js
@@ -52,7 +52,7 @@ function authStateListener() {
   onAuthStateChanged(auth, (user) => {
     if (user) {
       // User is signed in, see docs for a list of available properties
-      // https://firebase.google.com/docs/reference/js/firebase.User
+      // https://firebase.google.com/docs/reference/js/v8/firebase.User
       const uid = user.uid;
       // ...
     } else {
@@ -72,7 +72,7 @@ function currentUser() {
 
   if (user) {
     // User is signed in, see docs for a list of available properties
-    // https://firebase.google.com/docs/reference/js/firebase.User
+    // https://firebase.google.com/docs/reference/js/v8/firebase.User
     // ...
   } else {
     // No user is signed in.
@@ -87,7 +87,7 @@ function setLanguageCode() {
   const auth = getAuth();
   auth.languageCode = 'it';
   // To apply the default browser preference instead of explicitly setting it.
-  // firebase.auth().useDeviceLanguage();
+  // auth.useDeviceLanguage();
   // [END auth_set_language_code]
 }
 
diff --git a/auth-next/link-multiple-accounts.js b/auth-next/link-multiple-accounts.js
index 34c0db58..1938aafc 100644
--- a/auth-next/link-multiple-accounts.js
+++ b/auth-next/link-multiple-accounts.js
@@ -182,3 +182,61 @@ function unlink(providerId) {
   });
   // [END auth_unlink_provider]
 }
+
+function accountExistsPopup(auth, facebookProvider, goToApp, promptUserForPassword, promptUserForSignInMethod, getProviderForProviderId) {
+  // [START account_exists_popup]
+  const { signInWithPopup, signInWithEmailAndPassword, linkWithCredential } = require("firebase/auth");
+
+  // User tries to sign in with Facebook.
+  signInWithPopup(auth, facebookProvider).catch((error) => {
+  // User's email already exists.
+  if (error.code === 'auth/account-exists-with-different-credential') {
+    // The pending Facebook credential.
+    const pendingCred = error.credential;
+    // The provider account's email address.
+    const email = error.customData.email;
+    
+    // Present the user with a list of providers they might have
+    // used to create the original account.
+    // Then, ask the user to sign in with the existing provider.
+    const method = promptUserForSignInMethod();
+      
+    if (method === 'password') {
+      // TODO: Ask the user for their password.
+      // In real scenario, you should handle this asynchronously.
+      const password = promptUserForPassword();
+      signInWithEmailAndPassword(auth, email, password).then((result) => {
+        return linkWithCredential(result.user, pendingCred);
+      }).then(() => {
+        // Facebook account successfully linked to the existing user.
+        goToApp();
+      });
+      return;
+    }
+      
+    // All other cases are external providers.
+    // Construct provider object for that provider.
+    // TODO: Implement getProviderForProviderId.
+    const provider = getProviderForProviderId(method);
+    // At this point, you should let the user know that they already have an
+    // account with a different provider, and validate they want to sign in
+    // with the new provider.
+    // Note: Browsers usually block popups triggered asynchronously, so in
+    // real app, you should ask the user to click on a "Continue" button
+    // that will trigger signInWithPopup().
+    signInWithPopup(auth, provider).then((result) => {
+      // Note: Identity Platform doesn't control the provider's sign-in
+      // flow, so it's possible for the user to sign in with an account
+      // with a different email from the first one.
+
+      // Link the Facebook credential. We have access to the pending
+      // credential, so we can directly call the link method.
+      linkWithCredential(result.user, pendingCred).then((userCred) => {
+        // Success.
+        goToApp();
+      });
+    });
+  }
+});
+// [END account_exists_popup]
+}
diff --git a/auth-next/package.json b/auth-next/package.json
index 48adc595..8d43bad1 100644
--- a/auth-next/package.json
+++ b/auth-next/package.json
@@ -6,6 +6,6 @@
   },
   "license": "Apache-2.0",
   "dependencies": {
-    "firebase": "^9.12.1"
+    "firebase": "^10.0.0"
   }
 }
diff --git a/auth-next/phone-auth.js b/auth-next/phone-auth.js
index cd894c64..99492f99 100644
--- a/auth-next/phone-auth.js
+++ b/auth-next/phone-auth.js
@@ -15,13 +15,13 @@ function recaptchaVerifierInvisible() {
   const { getAuth, RecaptchaVerifier } = require("firebase/auth");
 
   const auth = getAuth();
-  window.recaptchaVerifier = new RecaptchaVerifier('sign-in-button', {
+  window.recaptchaVerifier = new RecaptchaVerifier(auth, 'sign-in-button', {
     'size': 'invisible',
     'callback': (response) => {
       // reCAPTCHA solved, allow signInWithPhoneNumber.
       onSignInSubmit();
     }
-  }, auth);
+  });
   // [END auth_phone_recaptcha_verifier_invisible]
 }
 
@@ -30,7 +30,7 @@ function recaptchaVerifierVisible() {
   const { getAuth, RecaptchaVerifier } = require("firebase/auth");
 
   const auth = getAuth();
-  window.recaptchaVerifier = new RecaptchaVerifier('recaptcha-container', {
+  window.recaptchaVerifier = new RecaptchaVerifier(auth, 'recaptcha-container', {
     'size': 'normal',
     'callback': (response) => {
       // reCAPTCHA solved, allow signInWithPhoneNumber.
@@ -40,7 +40,7 @@ function recaptchaVerifierVisible() {
       // Response expired. Ask user to solve reCAPTCHA again.
       // ...
     }
-  }, auth);
+  });
   // [END auth_phone_recaptcha_verifier_visible]
 }
 
@@ -49,7 +49,7 @@ function recaptchaVerifierSimple() {
   const { getAuth, RecaptchaVerifier } = require("firebase/auth");
 
   const auth = getAuth();
-  window.recaptchaVerifier = new RecaptchaVerifier('recaptcha-container', {}, auth);
+  window.recaptchaVerifier = new RecaptchaVerifier(auth, 'recaptcha-container', {});
   // [END auth_phone_recaptcha_verifier_simple]
 }
 
diff --git a/auth-next/twitter.js b/auth-next/twitter.js
index a386e4ab..f96e574b 100644
--- a/auth-next/twitter.js
+++ b/auth-next/twitter.js
@@ -30,6 +30,7 @@ function twitterSignInPopup(provider) {
 
       // The signed-in user info.
       const user = result.user;
+      // IdP data available using getAdditionalUserInfo(result)
       // ...
     }).catch((error) => {
       // Handle Errors here.
@@ -60,6 +61,8 @@ function twitterSignInRedirectResult() {
 
       // The signed-in user info.
       const user = result.user;
+      // IdP data available using getAdditionalUserInfo(result)
+      // ...
     }).catch((error) => {
       // Handle Errors here.
       const errorCode = error.code;
diff --git a/auth/apple.js b/auth/apple.js
index e99349c8..00e2598e 100644
--- a/auth/apple.js
+++ b/auth/apple.js
@@ -40,7 +40,8 @@ function appleSignInPopup(provider) {
       var accessToken = credential.accessToken;
       var idToken = credential.idToken;
 
-      // ...
+      // IdP data available using getAdditionalUserInfo(result)
+    // ...
     })
     .catch((error) => {
       // Handle Errors here.
@@ -77,6 +78,7 @@ function appleSignInRedirectResult() {
         var accessToken = credential.accessToken;
         var idToken = credential.idToken;
 
+        // IdP data available in result.additionalUserInfo.profile.
         // ...
       }
       // The signed-in user info.
@@ -117,7 +119,8 @@ function appleReauthenticatePopup() {
       var accessToken = credential.accessToken;
       var idToken = credential.idToken;
   
-      // ...
+      // IdP data available in result.additionalUserInfo.profile.
+        // ...
     })
     .catch((error) => {
       // Handle Errors here.
diff --git a/auth/emulator-suite.js b/auth/emulator-suite.js
index b14a72db..b0f815e2 100644
--- a/auth/emulator-suite.js
+++ b/auth/emulator-suite.js
@@ -4,7 +4,7 @@ import "firebase/auth";
 function emulatorConnect() {
   // [START auth_emulator_connect]
   const auth = firebase.auth();
-  auth.useEmulator("http://localhost:9099");
+  auth.useEmulator("http://127.0.0.1:9099");
   // [END auth_emulator_connect]
 }
 
diff --git a/auth/facebook.js b/auth/facebook.js
index 4259960d..75e99d43 100644
--- a/auth/facebook.js
+++ b/auth/facebook.js
@@ -31,6 +31,8 @@ function facebookSignInPopup(provider) {
 
       // The signed-in user info.
       var user = result.user;
+      // IdP data available in result.additionalUserInfo.profile.
+        // ...
 
       // This gives you a Facebook Access Token. You can use it to access the Facebook API.
       var accessToken = credential.accessToken;
@@ -66,6 +68,8 @@ function facebookSignInRedirectResult() {
       }
       // The signed-in user info.
       var user = result.user;
+      // IdP data available in result.additionalUserInfo.profile.
+        // ...
     }).catch((error) => {
       // Handle Errors here.
       var errorCode = error.code;
diff --git a/auth/github.js b/auth/github.js
index 6ae1e531..8ae9b39c 100644
--- a/auth/github.js
+++ b/auth/github.js
@@ -40,7 +40,8 @@ function githubSignInPopup(provider) {
 
       // The signed-in user info.
       var user = result.user;
-      // ...
+      // IdP data available in result.additionalUserInfo.profile.
+        // ...
     }).catch((error) => {
       // Handle Errors here.
       var errorCode = error.code;
@@ -70,6 +71,8 @@ function githubSignInRedirectResult() {
 
       // The signed-in user info.
       var user = result.user;
+      // IdP data available in result.additionalUserInfo.profile.
+        // ...
     }).catch((error) => {
       // Handle Errors here.
       var errorCode = error.code;
diff --git a/auth/google-signin.js b/auth/google-signin.js
index fcc32dc8..06a488e4 100644
--- a/auth/google-signin.js
+++ b/auth/google-signin.js
@@ -34,7 +34,8 @@ function googleSignInPopup(provider) {
       var token = credential.accessToken;
       // The signed-in user info.
       var user = result.user;
-      // ...
+      // IdP data available in result.additionalUserInfo.profile.
+        // ...
     }).catch((error) => {
       // Handle Errors here.
       var errorCode = error.code;
@@ -63,6 +64,8 @@ function googleSignInRedirectResult() {
       }
       // The signed-in user info.
       var user = result.user;
+      // IdP data available in result.additionalUserInfo.profile.
+        // ...
     }).catch((error) => {
       // Handle Errors here.
       var errorCode = error.code;
diff --git a/auth/index.js b/auth/index.js
index 6567c030..35546aa3 100644
--- a/auth/index.js
+++ b/auth/index.js
@@ -43,7 +43,7 @@ function authStateListener() {
   firebase.auth().onAuthStateChanged((user) => {
     if (user) {
       // User is signed in, see docs for a list of available properties
-      // https://firebase.google.com/docs/reference/js/firebase.User
+      // https://firebase.google.com/docs/reference/js/v8/firebase.User
       var uid = user.uid;
       // ...
     } else {
@@ -60,7 +60,7 @@ function currentUser() {
 
   if (user) {
     // User is signed in, see docs for a list of available properties
-    // https://firebase.google.com/docs/reference/js/firebase.User
+    // https://firebase.google.com/docs/reference/js/v8/firebase.User
     // ...
   } else {
     // No user is signed in.
diff --git a/auth/link-multiple-accounts.js b/auth/link-multiple-accounts.js
index 30f5a2ec..8eed77b8 100644
--- a/auth/link-multiple-accounts.js
+++ b/auth/link-multiple-accounts.js
@@ -166,3 +166,59 @@ function unlink(providerId) {
   });
   // [END auth_unlink_provider]
 }
+
+function accountExistsPopup(facebookProvider, goToApp, promptUserForPassword, promptUserForSignInMethod, getProviderForProviderId) {
+  // [START account_exists_popup]
+  // User tries to sign in with Facebook.
+      auth.signInWithPopup(facebookProvider).catch((error) => {
+  // User's email already exists.
+  if (error.code === 'auth/account-exists-with-different-credential') {
+    // The pending Facebook credential.
+    const pendingCred = error.credential;
+    // The provider account's email address.
+    const email = error.email;
+    
+    // Present the user with a list of providers they might have
+    // used to create the original account.
+    // Then, ask the user to sign in with the existing provider.
+    const method = promptUserForSignInMethod();
+      
+    if (method === 'password') {
+      // TODO: Ask the user for their password.
+      // In real scenario, you should handle this asynchronously.
+      const password = promptUserForPassword();
+      auth.signInWithEmailAndPassword(email, password).then((result) => {
+        return result.user.linkWithCredential(pendingCred);
+      }).then(() => {
+        // Facebook account successfully linked to the existing user.
+        goToApp();
+      });
+      return;
+    }
+      
+    // All other cases are external providers.
+    // Construct provider object for that provider.
+    // TODO: Implement getProviderForProviderId.
+    const provider = getProviderForProviderId(method);
+    // At this point, you should let the user know that they already have an
+    // account with a different provider, and validate they want to sign in
+    // with the new provider.
+    // Note: Browsers usually block popups triggered asynchronously, so in
+    // real app, you should ask the user to click on a "Continue" button
+    // that will trigger signInWithPopup().
+    auth.signInWithPopup(provider).then((result) => {
+      // Note: Identity Platform doesn't control the provider's sign-in
+      // flow, so it's possible for the user to sign in with an account
+      // with a different email from the first one.
+
+      // Link the Facebook credential. We have access to the pending
+      // credential, so we can directly call the link method.
+      result.user.linkWithCredential(pendingCred).then((userCred) => {
+        // Success.
+        goToApp();
+      });
+    });
+  }
+});
+// [END account_exists_popup]
+}
diff --git a/auth/package.json b/auth/package.json
index a6827027..b4b13f01 100644
--- a/auth/package.json
+++ b/auth/package.json
@@ -7,6 +7,7 @@
   "license": "Apache 2.0",
   "dependencies": {
     "firebase": "^8.10.0",
+    "firebase-admin": "^12.0.0",
     "firebaseui": "^5.0.0"
   }
 }
diff --git a/auth/service-worker-sessions.js b/auth/service-worker-sessions.js
index babbf91e..05791463 100644
--- a/auth/service-worker-sessions.js
+++ b/auth/service-worker-sessions.js
@@ -162,3 +162,46 @@ function svcSignInEmail(email, password) {
     });
   // [END auth_svc_sign_in_email]
 }
+
+function svcRedirectAdmin() {
+  const app = { use: (a) => {} };
+
+  // [START auth_svc_admin]
+  // Server side code.
+  const admin = require('firebase-admin');
+
+  // The Firebase Admin SDK is used here to verify the ID token.
+  admin.initializeApp();
+
+  function getIdToken(req) {
+    // Parse the injected ID token from the request header.
+    const authorizationHeader = req.headers.authorization || '';
+    const components = authorizationHeader.split(' ');
+    return components.length > 1 ? components[1] : '';
+  }
+
+  function checkIfSignedIn(url) {
+    return (req, res, next) => {
+      if (req.url == url) {
+        const idToken = getIdToken(req);
+        // Verify the ID token using the Firebase Admin SDK.
+        // User already logged in. Redirect to profile page.
+        admin.auth().verifyIdToken(idToken).then((decodedClaims) => {
+          // User is authenticated, user claims can be retrieved from
+          // decodedClaims.
+          // In this sample code, authenticated users are always redirected to
+          // the profile page.
+          res.redirect('/profile');
+        }).catch((error) => {
+          next();
+        });
+      } else {
+        next();
+      }
+    };
+  }
+
+  // If a user is signed in, redirect to profile page.
+  app.use(checkIfSignedIn('/'));
+  // [END auth_svc_admin]
+}
diff --git a/auth/twitter.js b/auth/twitter.js
index a78370b7..68ed6f35 100644
--- a/auth/twitter.js
+++ b/auth/twitter.js
@@ -32,7 +32,8 @@ function twitterSignInPopup(provider) {
 
       // The signed-in user info.
       var user = result.user;
-      // ...
+      // IdP data available in result.additionalUserInfo.profile.
+        // ...
     }).catch((error) => {
       // Handle Errors here.
       var errorCode = error.code;
@@ -64,6 +65,8 @@ function twitterSignInRedirectResult() {
 
       // The signed-in user info.
       var user = result.user;
+      // IdP data available in result.additionalUserInfo.profile.
+        // ...
     }).catch((error) => {
       // Handle Errors here.
       var errorCode = error.code;
diff --git a/database-next/emulator-suite.js b/database-next/emulator-suite.js
index ab86bf9b..f94d3c89 100644
--- a/database-next/emulator-suite.js
+++ b/database-next/emulator-suite.js
@@ -8,7 +8,7 @@ function onDocumentReady() {
   const db = getDatabase();
   if (location.hostname === "localhost") {
     // Point to the RTDB emulator running on localhost.
-    connectDatabaseEmulator(db, "localhost", 9000);
+    connectDatabaseEmulator(db, "127.0.0.1", 9000);
   } 
   // [END rtdb_emulator_connect]
 }
diff --git a/database-next/package.json b/database-next/package.json
index be3cab88..eb16e2d5 100644
--- a/database-next/package.json
+++ b/database-next/package.json
@@ -6,6 +6,6 @@
   },
   "license": "Apache-2.0",
   "dependencies": {
-    "firebase": "^9.12.1"
+    "firebase": "^10.0.0"
   }
 }
diff --git a/database-next/read-and-write.js b/database-next/read-and-write.js
index 4196c0d7..c06c66b4 100644
--- a/database-next/read-and-write.js
+++ b/database-next/read-and-write.js
@@ -44,7 +44,7 @@ function socialListenStarCount() {
   }
 
   // [START rtdb_social_listen_star_count]
-  const { getDatabase, ref, onValue} = require("firebase/database");
+  const { getDatabase, ref, onValue } = require("firebase/database");
 
   const db = getDatabase();
   const starCountRef = ref(db, 'posts/' + postId + '/starCount');
diff --git a/database/emulator-suite.js b/database/emulator-suite.js
index 8fe739e4..8da23e25 100644
--- a/database/emulator-suite.js
+++ b/database/emulator-suite.js
@@ -10,7 +10,7 @@ function onDocumentReady() {
   var db = firebase.database();
   if (location.hostname === "localhost") {
     // Point to the RTDB emulator running on localhost.
-    db.useEmulator("localhost", 9000);
+    db.useEmulator("127.0.0.1", 9000);
   } 
   // [END rtdb_emulator_connect]
 }
diff --git a/firebaseapp-next/package.json b/firebaseapp-next/package.json
index d7b654df..13cc74cd 100644
--- a/firebaseapp-next/package.json
+++ b/firebaseapp-next/package.json
@@ -6,6 +6,6 @@
   },
   "license": "Apache-2.0",
   "dependencies": {
-    "firebase": "^9.12.1"
+    "firebase": "^10.0.0"
   }
 }
diff --git a/firebaseserverapp-next/firebaseserverapp.js b/firebaseserverapp-next/firebaseserverapp.js
new file mode 100644
index 00000000..d0ab338c
--- /dev/null
+++ b/firebaseserverapp-next/firebaseserverapp.js
@@ -0,0 +1,27 @@
+// @ts-nocheck
+// [START serverapp_auth]
+import { initializeServerApp } from 'firebase/app';
+import { getAuth } from 'firebase/auth';
+import { headers } from 'next/headers';
+import { redirect } from 'next/navigation';
+
+export default function MyServerComponent() {
+
+    // Get relevant request headers (in Next.JS)
+    const authIdToken = headers().get('Authorization')?.split('Bearer ')[1];
+
+    // Initialize the FirebaseServerApp instance.
+    const serverApp = initializeServerApp(firebaseConfig, { authIdToken });
+
+    // Initialize Firebase Authentication using the FirebaseServerApp instance.
+    const auth = getAuth(serverApp);
+
+    if (auth.currentUser) {
+        redirect('/profile');
+    }
+
+    // ...
+}
+// [END serverapp_auth]
+
+const firebaseConfig = {};
diff --git a/firebaseserverapp-next/package.json b/firebaseserverapp-next/package.json
new file mode 100644
index 00000000..0836b0b2
--- /dev/null
+++ b/firebaseserverapp-next/package.json
@@ -0,0 +1,12 @@
+{
+  "name": "firebaseserverapp-next",
+  "version": "1.0.0",
+  "scripts": {
+    "compile": "cp ../tsconfig.json.template ./tsconfig.json && tsc"
+  },
+  "license": "Apache-2.0",
+  "dependencies": {
+    "firebase": "^10.0.0",
+    "next": "^14.1.3"
+  }
+}
diff --git a/firestore-next/emulator-suite.js b/firestore-next/emulator-suite.js
index 30ad24eb..edc900c1 100644
--- a/firestore-next/emulator-suite.js
+++ b/firestore-next/emulator-suite.js
@@ -7,6 +7,6 @@ function onDocumentReady() {
 
   // firebaseApps previously initialized using initializeApp()
   const db = getFirestore();
-  connectFirestoreEmulator(db, 'localhost', 8080);
+  connectFirestoreEmulator(db, '127.0.0.1', 8080);
   // [END fs_emulator_connect]
 }
diff --git a/firestore-next/package.json b/firestore-next/package.json
index 39b5c6a9..ef3b8708 100644
--- a/firestore-next/package.json
+++ b/firestore-next/package.json
@@ -6,7 +6,7 @@
   },
   "license": "Apache-2.0",
   "dependencies": {
-    "firebase": "^9.12.1",
+    "firebase": "^10.0.0",
     "geofire-common": "^5.1.0"
   },
   "devDependencies": {
diff --git a/firestore-next/test.firestore.js b/firestore-next/test.firestore.js
index 2469b736..969c1654 100644
--- a/firestore-next/test.firestore.js
+++ b/firestore-next/test.firestore.js
@@ -583,7 +583,7 @@ describe("firestore", () => {
             if (docSnap.exists()) {
               console.log("Document data:", docSnap.data());
             } else {
-              // doc.data() will be undefined in this case
+              // docSnap.data() will be undefined in this case
               console.log("No such document!");
             }
             // [END get_document]
@@ -683,6 +683,18 @@ describe("firestore", () => {
             // [END get_multiple_all]
         });
 
+        it("should get all documents from a subcollection", async () => {
+          // [START firestore_query_subcollection]
+          const { collection, getDocs } = require("firebase/firestore");
+          // Query a reference to a subcollection
+          const querySnapshot = await getDocs(collection(db, "cities", "SF", "landmarks"));
+          querySnapshot.forEach((doc) => {
+            // doc.data() is never undefined for query doc snapshots
+            console.log(doc.id, " => ", doc.data());
+          });
+          // [END firestore_query_subcollection]
+      });
+
         it("should listen on multiple documents #UNVERIFIED", (done) => {
             // [START listen_multiple]
             const { collection, query, where, onSnapshot } = require("firebase/firestore");
@@ -908,7 +920,7 @@ describe("firestore", () => {
                 // [START in_filter_with_array]
                 const { query, where } = require("firebase/firestore");  
 
-                const q = query(citiesRef, where('regions', 'in', [['west_coast', 'east_coast']]));
+                const q = query(citiesRef, where('regions', 'in', [['west_coast'], ['east_coast']]));
                 // [END in_filter_with_array]
               }
             });
diff --git a/firestore/emulator-suite.js b/firestore/emulator-suite.js
index 714d38e7..03aef1e9 100644
--- a/firestore/emulator-suite.js
+++ b/firestore/emulator-suite.js
@@ -6,7 +6,7 @@ function onDocumentReady() {
   // Firebase previously initialized using firebase.initializeApp().
   var db = firebase.firestore();
   if (location.hostname === "localhost") {
-    db.useEmulator("localhost", 8080);
+    db.useEmulator("127.0.0.1", 8080);
   }
   // [END fs_emulator_connect]
 }
diff --git a/firestore/test.firestore.js b/firestore/test.firestore.js
index dbf6e18e..20032d36 100644
--- a/firestore/test.firestore.js
+++ b/firestore/test.firestore.js
@@ -600,7 +600,7 @@ describe("firestore", () => {
             var docRef = db.collection("cities").doc("SF");
 
             // Valid options for source are 'server', 'cache', or
-            // 'default'. See https://firebase.google.com/docs/reference/js/firebase.firestore.GetOptions
+            // 'default'. See https://firebase.google.com/docs/reference/js/v8/firebase.firestore.GetOptions
             // for more information.
             var getOptions = {
                 source: 'cache'
@@ -893,7 +893,7 @@ describe("firestore", () => {
 
                 // [START in_filter_with_array]
                 citiesRef.where('regions', 'in',
-                    [['west_coast', 'east_coast']]);
+                    [['west_coast'], ['east_coast']]);
                 // [END in_filter_with_array]
             });
 
diff --git a/firestore/test.solution-counters.js b/firestore/test.solution-counters.js
index c8c62fe6..c7c51cff 100644
--- a/firestore/test.solution-counters.js
+++ b/firestore/test.solution-counters.js
@@ -22,7 +22,7 @@ function createCounter(ref, num_shards) {
 // [END create_counter]
 
 // [START increment_counter]
-function incrementCounter(db, ref, num_shards) {
+function incrementCounter(ref, num_shards) {
     // Select a shard of the counter at random
     const shard_id = Math.floor(Math.random() * num_shards).toString();
     const shard_ref = ref.collection('shards').doc(shard_id);
@@ -67,7 +67,7 @@ describe("firestore-solution-counters", () => {
             // Create a counter, then increment it
             const ref = db.collection('counters').doc();
             return createCounter(ref, 10).then(() => {
-                return incrementCounter(db, ref, 10);
+                return incrementCounter(ref, 10);
             });
         });
 
@@ -75,7 +75,7 @@ describe("firestore-solution-counters", () => {
             // Create a counter, increment it, then get the count
             const ref = db.collection('counters').doc();
             return createCounter(ref, 10).then(() => {
-                return incrementCounter(db, ref, 10);
+                return incrementCounter(ref, 10);
             }).then(() => {
                 return getCount(ref);
             });
diff --git a/functions-next/emulator-suite.js b/functions-next/emulator-suite.js
index 7a750fc4..db7fd49d 100644
--- a/functions-next/emulator-suite.js
+++ b/functions-next/emulator-suite.js
@@ -15,7 +15,7 @@ export function emulatorSettings() {
   const { getFunctions, connectFunctionsEmulator } = require("firebase/functions");
 
   const functions = getFunctions(getApp());
-  connectFunctionsEmulator(functions, "localhost", 5001);
+  connectFunctionsEmulator(functions, "127.0.0.1", 5001);
   // [END fb_functions_emulator_connect]
 }
 
diff --git a/functions-next/package.json b/functions-next/package.json
index 618ee0c5..14f097ee 100644
--- a/functions-next/package.json
+++ b/functions-next/package.json
@@ -6,6 +6,6 @@
   },
   "license": "Apache-2.0",
   "dependencies": {
-    "firebase": "^9.12.1"
+    "firebase": "^10.0.0"
   }
 }
diff --git a/functions/emulator-suite.js b/functions/emulator-suite.js
index a9cdc7d7..e0413370 100644
--- a/functions/emulator-suite.js
+++ b/functions/emulator-suite.js
@@ -3,6 +3,6 @@ import "firebase/functions";
 
 function emulatorSettings() {
   // [START fb_functions_emulator_connect]
-  firebase.functions().useEmulator("localhost", 5001);
+  firebase.functions().useEmulator("127.0.0.1", 5001);
   // [END fb_functions_emulator_connect]
 }
diff --git a/messaging-next/package.json b/messaging-next/package.json
index 2eb86c54..e4887a2a 100644
--- a/messaging-next/package.json
+++ b/messaging-next/package.json
@@ -6,6 +6,6 @@
   },
   "license": "Apache-2.0",
   "dependencies": {
-    "firebase": "^9.12.1"
+    "firebase": "^10.0.0"
   }
 }
diff --git a/messaging-next/service-worker.js b/messaging-next/service-worker.js
index a81a7c18..55f07524 100644
--- a/messaging-next/service-worker.js
+++ b/messaging-next/service-worker.js
@@ -40,7 +40,7 @@ function initInSw() {
 
 function onBackgroundMessage() {
   // [START messaging_on_background_message]
-  const { getMessaging } = require("firebase/messaging");
+  const { getMessaging } = require("firebase/messaging/sw");
   const { onBackgroundMessage } = require("firebase/messaging/sw");
 
   const messaging = getMessaging();
diff --git a/messaging/service-worker.js b/messaging/service-worker.js
index 26f9d097..1a202159 100644
--- a/messaging/service-worker.js
+++ b/messaging/service-worker.js
@@ -1,5 +1,5 @@
-import firebase from "firebase/app";
-import "firebase/messaging";
+import firebase from 'firebase/app';
+import 'firebase/messaging';
 
 // See: https://github.com/microsoft/TypeScript/issues/14877
 /** @type {ServiceWorkerGlobalScope} */
@@ -10,8 +10,9 @@ function initInSw() {
   // Give the service worker access to Firebase Messaging.
   // Note that you can only use Firebase Messaging here. Other Firebase libraries
   // are not available in the service worker.
-  importScripts('https://www.gstatic.com/firebasejs/9.2.0/firebase-app.js');
-  importScripts('https://www.gstatic.com/firebasejs/9.2.0/firebase-messaging.js');
+  // Replace 10.13.2 with latest version of the Firebase JS SDK.
+  importScripts('https://www.gstatic.com/firebasejs/10.13.2/firebase-app-compat.js');
+  importScripts('https://www.gstatic.com/firebasejs/10.13.2/firebase-messaging-compat.js');
 
   // Initialize the Firebase app in the service worker by passing in
   // your app's Firebase config object.
@@ -38,16 +39,18 @@ function onBackgroundMessage() {
 
   // [START messaging_on_background_message]
   messaging.onBackgroundMessage((payload) => {
-    console.log('[firebase-messaging-sw.js] Received background message ', payload);
+    console.log(
+      '[firebase-messaging-sw.js] Received background message ',
+      payload
+    );
     // Customize notification here
     const notificationTitle = 'Background Message Title';
     const notificationOptions = {
       body: 'Background Message body.',
       icon: '/firebase-logo.png'
     };
-  
-    self.registration.showNotification(notificationTitle,
-      notificationOptions);
+
+    self.registration.showNotification(notificationTitle, notificationOptions);
   });
   // [END messaging_on_background_message]
 }
diff --git a/perf-next/package.json b/perf-next/package.json
index e05ef409..688f6db0 100644
--- a/perf-next/package.json
+++ b/perf-next/package.json
@@ -6,6 +6,6 @@
   },
   "license": "Apache-2.0",
   "dependencies": {
-    "firebase": "^9.12.1"
+    "firebase": "^10.0.0"
   }
 }
diff --git a/remoteconfig-next/index.js b/remoteconfig-next/index.js
index aeeb263a..287f3c99 100644
--- a/remoteconfig-next/index.js
+++ b/remoteconfig-next/index.js
@@ -14,6 +14,7 @@ function getInstance() {
 function setMinimumFetchTime() {
   const remoteConfig = getInstance();
   // [START rc_set_minimum_fetch_time]
+  // The default and recommended production fetch interval for Remote Config is 12 hours
   remoteConfig.settings.minimumFetchIntervalMillis = 3600000;
   // [END rc_set_minimum_fetch_time]
 }
diff --git a/remoteconfig-next/package.json b/remoteconfig-next/package.json
index ffbd6c3e..952b1540 100644
--- a/remoteconfig-next/package.json
+++ b/remoteconfig-next/package.json
@@ -6,6 +6,6 @@
   },
   "license": "Apache-2.0",
   "dependencies": {
-    "firebase": "^9.12.1"
+    "firebase": "^10.0.0"
   }
 }
diff --git a/scripts/separate-snippets.ts b/scripts/separate-snippets.ts
index a888d908..b2f41de3 100644
--- a/scripts/separate-snippets.ts
+++ b/scripts/separate-snippets.ts
@@ -18,6 +18,15 @@ const RE_END_SNIPPET = /\[END\s+([A-Za-z_]+)\s*\]/;
 // TODO: Handle multiline imports?
 const RE_REQUIRE = /const {(.+?)} = require\((.+?)\)/;
 
+// Regex for ref docs URLs
+// eg. "https://firebase.google.com/docs/reference/js/v8/firebase.User"
+const RE_REF_DOCS = /https:\/\/firebase\.google\.com\/docs\/reference\/js\/(.*)/;
+
+// Maps v8 ref docs URLs to their v9 counterpart
+const REF_DOCS_MAPPINGS: { [key: string]: string } = {
+  "v8/firebase.User" : "auth.user"
+};
+
 type SnippetsConfig = {
   enabled: boolean;
   suffix: string;
@@ -30,6 +39,23 @@ function isBlank(line: string) {
   return line.trim().length === 0;
 }
 
+/**
+ * Replace all v8 ref doc urls with their v9 counterpart.
+ */
+function replaceRefDocsUrls(lines: string[]) {
+  const outputLines = [];
+  for (const line of lines) {
+    if (line.match(RE_REF_DOCS)) {
+      outputLines.push(line.replace(RE_REF_DOCS, (match: string, p1?: string) => {
+        return p1 ? `https://firebase.google.com/docs/reference/js/${REF_DOCS_MAPPINGS[p1]}` : match;
+      }));
+    } else {
+      outputLines.push(line);
+    }
+  }
+  return outputLines;
+}
+
 /**
  * Replace all const { foo } = require('bar') with import { foo } from 'bar';
  */
@@ -119,6 +145,7 @@ function processSnippet(
   outputLines = addSuffixToSnippetNames(outputLines, snippetSuffix);
   outputLines = adjustIndentation(outputLines);
   outputLines = removeFirstLineAfterComments(outputLines);
+  outputLines = replaceRefDocsUrls(outputLines);
 
   // Add a preamble to every snippet
   const preambleLines = [
diff --git a/snippets/auth-next/apple/auth_apple_signin_popup.js b/snippets/auth-next/apple/auth_apple_signin_popup.js
index c2a392cf..e3a0f11b 100644
--- a/snippets/auth-next/apple/auth_apple_signin_popup.js
+++ b/snippets/auth-next/apple/auth_apple_signin_popup.js
@@ -18,6 +18,7 @@ signInWithPopup(auth, provider)
     const accessToken = credential.accessToken;
     const idToken = credential.idToken;
 
+    // IdP data available using getAdditionalUserInfo(result)
     // ...
   })
   .catch((error) => {
diff --git a/snippets/auth-next/custom-email-handler/auth_handle_mgmt_query_params.js b/snippets/auth-next/custom-email-handler/auth_handle_mgmt_query_params.js
index 6dec3399..d0a22696 100644
--- a/snippets/auth-next/custom-email-handler/auth_handle_mgmt_query_params.js
+++ b/snippets/auth-next/custom-email-handler/auth_handle_mgmt_query_params.js
@@ -23,8 +23,8 @@ document.addEventListener('DOMContentLoaded', () => {
   // Configure the Firebase SDK.
   // This is the minimum configuration required for the API to be used.
   const config = {
-    'apiKey': "YOU_API_KEY" // Copy this key from the web initialization
-                            // snippet found in the Firebase console.
+    'apiKey': "YOUR_API_KEY" // Copy this key from the web initialization
+                             // snippet found in the Firebase console.
   };
   const app = initializeApp(config);
   const auth = getAuth(app);
diff --git a/snippets/auth-next/email-link-auth/auth_email_link_actioncode_settings.js b/snippets/auth-next/email-link-auth/auth_email_link_actioncode_settings.js
index a1480a11..010b5c09 100644
--- a/snippets/auth-next/email-link-auth/auth_email_link_actioncode_settings.js
+++ b/snippets/auth-next/email-link-auth/auth_email_link_actioncode_settings.js
@@ -19,6 +19,7 @@ const actionCodeSettings = {
     installApp: true,
     minimumVersion: '12'
   },
-  dynamicLinkDomain: 'example.page.link'
+  // The domain must be configured in Firebase Hosting and owned by the project.
+  linkDomain: 'custom-domain.com'
 };
 // [END auth_email_link_actioncode_settings_modular]
\ No newline at end of file
diff --git a/snippets/auth-next/email-link-auth/email_link_complete.js b/snippets/auth-next/email-link-auth/email_link_complete.js
index b42b9af9..dbe1143d 100644
--- a/snippets/auth-next/email-link-auth/email_link_complete.js
+++ b/snippets/auth-next/email-link-auth/email_link_complete.js
@@ -26,11 +26,13 @@ if (isSignInWithEmailLink(auth, window.location.href)) {
     .then((result) => {
       // Clear email from storage.
       window.localStorage.removeItem('emailForSignIn');
-      // You can access the new user via result.user
-      // Additional user info profile not available via:
-      // result.additionalUserInfo.profile == null
+      // You can access the new user by importing getAdditionalUserInfo
+      // and calling it with result:
+      // getAdditionalUserInfo(result)
+      // You can access the user's profile via:
+      // getAdditionalUserInfo(result)?.profile
       // You can check if the user is new or existing:
-      // result.additionalUserInfo.isNewUser
+      // getAdditionalUserInfo(result)?.isNewUser
     })
     .catch((error) => {
       // Some error occurred, you can inspect the code: error.code
diff --git a/snippets/auth-next/email/auth_signup_password.js b/snippets/auth-next/email/auth_signup_password.js
index 00aa9bd5..936b64ce 100644
--- a/snippets/auth-next/email/auth_signup_password.js
+++ b/snippets/auth-next/email/auth_signup_password.js
@@ -10,7 +10,7 @@ import { getAuth, createUserWithEmailAndPassword } from "firebase/auth";
 const auth = getAuth();
 createUserWithEmailAndPassword(auth, email, password)
   .then((userCredential) => {
-    // Signed in 
+    // Signed up 
     const user = userCredential.user;
     // ...
   })
diff --git a/snippets/auth-next/emulator-suite/auth_emulator_connect.js b/snippets/auth-next/emulator-suite/auth_emulator_connect.js
index dd0b2e37..525a92b8 100644
--- a/snippets/auth-next/emulator-suite/auth_emulator_connect.js
+++ b/snippets/auth-next/emulator-suite/auth_emulator_connect.js
@@ -8,5 +8,5 @@
 import { getAuth, connectAuthEmulator } from "firebase/auth";
 
 const auth = getAuth();
-connectAuthEmulator(auth, "http://localhost:9099");
+connectAuthEmulator(auth, "http://127.0.0.1:9099");
 // [END auth_emulator_connect_modular]
\ No newline at end of file
diff --git a/snippets/auth-next/facebook/auth_facebook_signin_popup.js b/snippets/auth-next/facebook/auth_facebook_signin_popup.js
index 7d35aaf2..524a11ac 100644
--- a/snippets/auth-next/facebook/auth_facebook_signin_popup.js
+++ b/snippets/auth-next/facebook/auth_facebook_signin_popup.js
@@ -17,6 +17,7 @@ signInWithPopup(auth, provider)
     const credential = FacebookAuthProvider.credentialFromResult(result);
     const accessToken = credential.accessToken;
 
+    // IdP data available using getAdditionalUserInfo(result)
     // ...
   })
   .catch((error) => {
diff --git a/snippets/auth-next/facebook/auth_facebook_signin_redirect_result.js b/snippets/auth-next/facebook/auth_facebook_signin_redirect_result.js
index eb6cdb30..c65c47d7 100644
--- a/snippets/auth-next/facebook/auth_facebook_signin_redirect_result.js
+++ b/snippets/auth-next/facebook/auth_facebook_signin_redirect_result.js
@@ -15,6 +15,8 @@ getRedirectResult(auth)
     const token = credential.accessToken;
 
     const user = result.user;
+    // IdP data available using getAdditionalUserInfo(result)
+    // ...
   }).catch((error) => {
     // Handle Errors here.
     const errorCode = error.code;
diff --git a/snippets/auth-next/github/auth_github_signin_popup.js b/snippets/auth-next/github/auth_github_signin_popup.js
index e1b4768e..3839a70f 100644
--- a/snippets/auth-next/github/auth_github_signin_popup.js
+++ b/snippets/auth-next/github/auth_github_signin_popup.js
@@ -16,6 +16,7 @@ signInWithPopup(auth, provider)
 
     // The signed-in user info.
     const user = result.user;
+    // IdP data available using getAdditionalUserInfo(result)
     // ...
   }).catch((error) => {
     // Handle Errors here.
diff --git a/snippets/auth-next/github/auth_github_signin_redirect_result.js b/snippets/auth-next/github/auth_github_signin_redirect_result.js
index b3d31d0a..fb5f7ca2 100644
--- a/snippets/auth-next/github/auth_github_signin_redirect_result.js
+++ b/snippets/auth-next/github/auth_github_signin_redirect_result.js
@@ -19,6 +19,8 @@ getRedirectResult(auth)
 
     // The signed-in user info.
     const user = result.user;
+    // IdP data available using getAdditionalUserInfo(result)
+    // ...
   }).catch((error) => {
     // Handle Errors here.
     const errorCode = error.code;
diff --git a/snippets/auth-next/google-signin/auth_google_signin_popup.js b/snippets/auth-next/google-signin/auth_google_signin_popup.js
index d6c70eb9..433bb88e 100644
--- a/snippets/auth-next/google-signin/auth_google_signin_popup.js
+++ b/snippets/auth-next/google-signin/auth_google_signin_popup.js
@@ -15,6 +15,7 @@ signInWithPopup(auth, provider)
     const token = credential.accessToken;
     // The signed-in user info.
     const user = result.user;
+    // IdP data available using getAdditionalUserInfo(result)
     // ...
   }).catch((error) => {
     // Handle Errors here.
diff --git a/snippets/auth-next/google-signin/auth_google_signin_redirect_result.js b/snippets/auth-next/google-signin/auth_google_signin_redirect_result.js
index 50c4aded..2953ab5f 100644
--- a/snippets/auth-next/google-signin/auth_google_signin_redirect_result.js
+++ b/snippets/auth-next/google-signin/auth_google_signin_redirect_result.js
@@ -16,6 +16,8 @@ getRedirectResult(auth)
 
     // The signed-in user info.
     const user = result.user;
+    // IdP data available using getAdditionalUserInfo(result)
+    // ...
   }).catch((error) => {
     // Handle Errors here.
     const errorCode = error.code;
diff --git a/snippets/auth-next/index/auth_current_user.js b/snippets/auth-next/index/auth_current_user.js
index c094a464..6925b021 100644
--- a/snippets/auth-next/index/auth_current_user.js
+++ b/snippets/auth-next/index/auth_current_user.js
@@ -12,7 +12,7 @@ const user = auth.currentUser;
 
 if (user) {
   // User is signed in, see docs for a list of available properties
-  // https://firebase.google.com/docs/reference/js/firebase.User
+  // https://firebase.google.com/docs/reference/js/auth.user
   // ...
 } else {
   // No user is signed in.
diff --git a/snippets/auth-next/index/auth_set_language_code.js b/snippets/auth-next/index/auth_set_language_code.js
index 47e78295..fe9a2025 100644
--- a/snippets/auth-next/index/auth_set_language_code.js
+++ b/snippets/auth-next/index/auth_set_language_code.js
@@ -10,5 +10,5 @@ import { getAuth } from "firebase/auth";
 const auth = getAuth();
 auth.languageCode = 'it';
 // To apply the default browser preference instead of explicitly setting it.
-// firebase.auth().useDeviceLanguage();
+// auth.useDeviceLanguage();
 // [END auth_set_language_code_modular]
\ No newline at end of file
diff --git a/snippets/auth-next/index/auth_state_listener.js b/snippets/auth-next/index/auth_state_listener.js
index aebe6818..0f3e4e88 100644
--- a/snippets/auth-next/index/auth_state_listener.js
+++ b/snippets/auth-next/index/auth_state_listener.js
@@ -11,7 +11,7 @@ const auth = getAuth();
 onAuthStateChanged(auth, (user) => {
   if (user) {
     // User is signed in, see docs for a list of available properties
-    // https://firebase.google.com/docs/reference/js/firebase.User
+    // https://firebase.google.com/docs/reference/js/auth.user
     const uid = user.uid;
     // ...
   } else {
diff --git a/snippets/auth-next/link-multiple-accounts/account_exists_popup.js b/snippets/auth-next/link-multiple-accounts/account_exists_popup.js
new file mode 100644
index 00000000..2c667882
--- /dev/null
+++ b/snippets/auth-next/link-multiple-accounts/account_exists_popup.js
@@ -0,0 +1,61 @@
+// This snippet file was generated by processing the source file:
+// ./auth-next/link-multiple-accounts.js
+//
+// To update the snippets in this file, edit the source and then run
+// 'npm run snippets'.
+
+  // [START account_exists_popup_modular]
+  import { signInWithPopup, signInWithEmailAndPassword, linkWithCredential } from "firebase/auth";
+
+  // User tries to sign in with Facebook.
+  signInWithPopup(auth, facebookProvider).catch((error) => {
+  // User's email already exists.
+  if (error.code === 'auth/account-exists-with-different-credential') {
+    // The pending Facebook credential.
+    const pendingCred = error.credential;
+    // The provider account's email address.
+    const email = error.customData.email;
+
+    // Present the user with a list of providers they might have
+    // used to create the original account.
+    // Then, ask the user to sign in with the existing provider.
+    const method = promptUserForSignInMethod();
+
+    if (method === 'password') {
+      // TODO: Ask the user for their password.
+      // In real scenario, you should handle this asynchronously.
+      const password = promptUserForPassword();
+      signInWithEmailAndPassword(auth, email, password).then((result) => {
+        return linkWithCredential(result.user, pendingCred);
+      }).then(() => {
+        // Facebook account successfully linked to the existing user.
+        goToApp();
+      });
+      return;
+    }
+
+    // All other cases are external providers.
+    // Construct provider object for that provider.
+    // TODO: Implement getProviderForProviderId.
+    const provider = getProviderForProviderId(method);
+    // At this point, you should let the user know that they already have an
+    // account with a different provider, and validate they want to sign in
+    // with the new provider.
+    // Note: Browsers usually block popups triggered asynchronously, so in
+    // real app, you should ask the user to click on a "Continue" button
+    // that will trigger signInWithPopup().
+    signInWithPopup(auth, provider).then((result) => {
+      // Note: Identity Platform doesn't control the provider's sign-in
+      // flow, so it's possible for the user to sign in with an account
+      // with a different email from the first one.
+
+      // Link the Facebook credential. We have access to the pending
+      // credential, so we can directly call the link method.
+      linkWithCredential(result.user, pendingCred).then((userCred) => {
+        // Success.
+        goToApp();
+      });
+    });
+  }
+});
+// [END account_exists_popup_modular]
\ No newline at end of file
diff --git a/snippets/auth-next/phone-auth/auth_phone_recaptcha_verifier_invisible.js b/snippets/auth-next/phone-auth/auth_phone_recaptcha_verifier_invisible.js
index f6b6893f..7fd16eea 100644
--- a/snippets/auth-next/phone-auth/auth_phone_recaptcha_verifier_invisible.js
+++ b/snippets/auth-next/phone-auth/auth_phone_recaptcha_verifier_invisible.js
@@ -8,11 +8,11 @@
 import { getAuth, RecaptchaVerifier } from "firebase/auth";
 
 const auth = getAuth();
-window.recaptchaVerifier = new RecaptchaVerifier('sign-in-button', {
+window.recaptchaVerifier = new RecaptchaVerifier(auth, 'sign-in-button', {
   'size': 'invisible',
   'callback': (response) => {
     // reCAPTCHA solved, allow signInWithPhoneNumber.
     onSignInSubmit();
   }
-}, auth);
+});
 // [END auth_phone_recaptcha_verifier_invisible_modular]
\ No newline at end of file
diff --git a/snippets/auth-next/phone-auth/auth_phone_recaptcha_verifier_simple.js b/snippets/auth-next/phone-auth/auth_phone_recaptcha_verifier_simple.js
index ed56fe99..b57eb37b 100644
--- a/snippets/auth-next/phone-auth/auth_phone_recaptcha_verifier_simple.js
+++ b/snippets/auth-next/phone-auth/auth_phone_recaptcha_verifier_simple.js
@@ -8,5 +8,5 @@
 import { getAuth, RecaptchaVerifier } from "firebase/auth";
 
 const auth = getAuth();
-window.recaptchaVerifier = new RecaptchaVerifier('recaptcha-container', {}, auth);
+window.recaptchaVerifier = new RecaptchaVerifier(auth, 'recaptcha-container', {});
 // [END auth_phone_recaptcha_verifier_simple_modular]
\ No newline at end of file
diff --git a/snippets/auth-next/phone-auth/auth_phone_recaptcha_verifier_visible.js b/snippets/auth-next/phone-auth/auth_phone_recaptcha_verifier_visible.js
index c91e6041..42ebbe69 100644
--- a/snippets/auth-next/phone-auth/auth_phone_recaptcha_verifier_visible.js
+++ b/snippets/auth-next/phone-auth/auth_phone_recaptcha_verifier_visible.js
@@ -8,7 +8,7 @@
 import { getAuth, RecaptchaVerifier } from "firebase/auth";
 
 const auth = getAuth();
-window.recaptchaVerifier = new RecaptchaVerifier('recaptcha-container', {
+window.recaptchaVerifier = new RecaptchaVerifier(auth, 'recaptcha-container', {
   'size': 'normal',
   'callback': (response) => {
     // reCAPTCHA solved, allow signInWithPhoneNumber.
@@ -18,5 +18,5 @@ window.recaptchaVerifier = new RecaptchaVerifier('recaptcha-container', {
     // Response expired. Ask user to solve reCAPTCHA again.
     // ...
   }
-}, auth);
+});
 // [END auth_phone_recaptcha_verifier_visible_modular]
\ No newline at end of file
diff --git a/snippets/auth-next/twitter/auth_twitter_signin_popup.js b/snippets/auth-next/twitter/auth_twitter_signin_popup.js
index ae8e2007..adb7322e 100644
--- a/snippets/auth-next/twitter/auth_twitter_signin_popup.js
+++ b/snippets/auth-next/twitter/auth_twitter_signin_popup.js
@@ -18,6 +18,7 @@ signInWithPopup(auth, provider)
 
     // The signed-in user info.
     const user = result.user;
+    // IdP data available using getAdditionalUserInfo(result)
     // ...
   }).catch((error) => {
     // Handle Errors here.
diff --git a/snippets/auth-next/twitter/auth_twitter_signin_redirect_result.js b/snippets/auth-next/twitter/auth_twitter_signin_redirect_result.js
index 73e42bab..357faa4e 100644
--- a/snippets/auth-next/twitter/auth_twitter_signin_redirect_result.js
+++ b/snippets/auth-next/twitter/auth_twitter_signin_redirect_result.js
@@ -19,6 +19,8 @@ getRedirectResult(auth)
 
     // The signed-in user info.
     const user = result.user;
+    // IdP data available using getAdditionalUserInfo(result)
+    // ...
   }).catch((error) => {
     // Handle Errors here.
     const errorCode = error.code;
diff --git a/snippets/database-next/emulator-suite/rtdb_emulator_connect.js b/snippets/database-next/emulator-suite/rtdb_emulator_connect.js
index 4cc268e7..0bd145f6 100644
--- a/snippets/database-next/emulator-suite/rtdb_emulator_connect.js
+++ b/snippets/database-next/emulator-suite/rtdb_emulator_connect.js
@@ -10,6 +10,6 @@ import { getDatabase, connectDatabaseEmulator } from "firebase/database";
 const db = getDatabase();
 if (location.hostname === "localhost") {
   // Point to the RTDB emulator running on localhost.
-  connectDatabaseEmulator(db, "localhost", 9000);
+  connectDatabaseEmulator(db, "127.0.0.1", 9000);
 } 
 // [END rtdb_emulator_connect_modular]
\ No newline at end of file
diff --git a/snippets/database-next/read-and-write/rtdb_social_listen_star_count.js b/snippets/database-next/read-and-write/rtdb_social_listen_star_count.js
index ab520ce6..eb782894 100644
--- a/snippets/database-next/read-and-write/rtdb_social_listen_star_count.js
+++ b/snippets/database-next/read-and-write/rtdb_social_listen_star_count.js
@@ -5,7 +5,7 @@
 // 'npm run snippets'.
 
 // [START rtdb_social_listen_star_count_modular]
-import { getDatabase, ref, onValue} from "firebase/database";
+import { getDatabase, ref, onValue } from "firebase/database";
 
 const db = getDatabase();
 const starCountRef = ref(db, 'posts/' + postId + '/starCount');
diff --git a/snippets/firestore-next/emulator-suite/fs_emulator_connect.js b/snippets/firestore-next/emulator-suite/fs_emulator_connect.js
index 7e31fcfd..d70fbb68 100644
--- a/snippets/firestore-next/emulator-suite/fs_emulator_connect.js
+++ b/snippets/firestore-next/emulator-suite/fs_emulator_connect.js
@@ -9,5 +9,5 @@ import { getFirestore, connectFirestoreEmulator } from "firebase/firestore";
 
 // firebaseApps previously initialized using initializeApp()
 const db = getFirestore();
-connectFirestoreEmulator(db, 'localhost', 8080);
+connectFirestoreEmulator(db, '127.0.0.1', 8080);
 // [END fs_emulator_connect_modular]
\ No newline at end of file
diff --git a/snippets/firestore-next/test-firestore/firestore_query_subcollection.js b/snippets/firestore-next/test-firestore/firestore_query_subcollection.js
new file mode 100644
index 00000000..76a1b847
--- /dev/null
+++ b/snippets/firestore-next/test-firestore/firestore_query_subcollection.js
@@ -0,0 +1,15 @@
+// This snippet file was generated by processing the source file:
+// ./firestore-next/test.firestore.js
+//
+// To update the snippets in this file, edit the source and then run
+// 'npm run snippets'.
+
+// [START firestore_query_subcollection_modular]
+import { collection, getDocs } from "firebase/firestore";
+// Query a reference to a subcollection
+const querySnapshot = await getDocs(collection(db, "cities", "SF", "landmarks"));
+querySnapshot.forEach((doc) => {
+  // doc.data() is never undefined for query doc snapshots
+  console.log(doc.id, " => ", doc.data());
+});
+// [END firestore_query_subcollection_modular]
\ No newline at end of file
diff --git a/snippets/firestore-next/test-firestore/get_document.js b/snippets/firestore-next/test-firestore/get_document.js
index 4cfbaaf6..1653b61a 100644
--- a/snippets/firestore-next/test-firestore/get_document.js
+++ b/snippets/firestore-next/test-firestore/get_document.js
@@ -13,7 +13,7 @@ const docSnap = await getDoc(docRef);
 if (docSnap.exists()) {
   console.log("Document data:", docSnap.data());
 } else {
-  // doc.data() will be undefined in this case
+  // docSnap.data() will be undefined in this case
   console.log("No such document!");
 }
 // [END get_document_modular]
\ No newline at end of file
diff --git a/snippets/firestore-next/test-firestore/in_filter_with_array.js b/snippets/firestore-next/test-firestore/in_filter_with_array.js
index ebe6f18b..190e9dfe 100644
--- a/snippets/firestore-next/test-firestore/in_filter_with_array.js
+++ b/snippets/firestore-next/test-firestore/in_filter_with_array.js
@@ -7,5 +7,5 @@
 // [START in_filter_with_array_modular]
 import { query, where } from "firebase/firestore";  
 
-const q = query(citiesRef, where('regions', 'in', [['west_coast', 'east_coast']]));
+const q = query(citiesRef, where('regions', 'in', [['west_coast'], ['east_coast']]));
 // [END in_filter_with_array_modular]
\ No newline at end of file
diff --git a/snippets/functions-next/emulator-suite/fb_functions_emulator_connect.js b/snippets/functions-next/emulator-suite/fb_functions_emulator_connect.js
index 9b186fc2..835a2c60 100644
--- a/snippets/functions-next/emulator-suite/fb_functions_emulator_connect.js
+++ b/snippets/functions-next/emulator-suite/fb_functions_emulator_connect.js
@@ -9,5 +9,5 @@ import { getApp } from "firebase/app";
 import { getFunctions, connectFunctionsEmulator } from "firebase/functions";
 
 const functions = getFunctions(getApp());
-connectFunctionsEmulator(functions, "localhost", 5001);
+connectFunctionsEmulator(functions, "127.0.0.1", 5001);
 // [END fb_functions_emulator_connect_modular]
\ No newline at end of file
diff --git a/snippets/messaging-next/service-worker/messaging_on_background_message.js b/snippets/messaging-next/service-worker/messaging_on_background_message.js
index b7f65b53..79c17eea 100644
--- a/snippets/messaging-next/service-worker/messaging_on_background_message.js
+++ b/snippets/messaging-next/service-worker/messaging_on_background_message.js
@@ -5,7 +5,7 @@
 // 'npm run snippets'.
 
 // [START messaging_on_background_message_modular]
-import { getMessaging } from "firebase/messaging";
+import { getMessaging } from "firebase/messaging/sw";
 import { onBackgroundMessage } from "firebase/messaging/sw";
 
 const messaging = getMessaging();
diff --git a/snippets/remoteconfig-next/index/rc_set_minimum_fetch_time.js b/snippets/remoteconfig-next/index/rc_set_minimum_fetch_time.js
index 131976c5..77aa9f45 100644
--- a/snippets/remoteconfig-next/index/rc_set_minimum_fetch_time.js
+++ b/snippets/remoteconfig-next/index/rc_set_minimum_fetch_time.js
@@ -5,5 +5,6 @@
 // 'npm run snippets'.
 
 // [START rc_set_minimum_fetch_time_modular]
+// The default and recommended production fetch interval for Remote Config is 12 hours
 remoteConfig.settings.minimumFetchIntervalMillis = 3600000;
 // [END rc_set_minimum_fetch_time_modular]
\ No newline at end of file
diff --git a/snippets/storage-next/emulator-suite/storage_emulator_connect.js b/snippets/storage-next/emulator-suite/storage_emulator_connect.js
new file mode 100644
index 00000000..4b247d17
--- /dev/null
+++ b/snippets/storage-next/emulator-suite/storage_emulator_connect.js
@@ -0,0 +1,15 @@
+// This snippet file was generated by processing the source file:
+// ./storage-next/emulator-suite.js
+//
+// To update the snippets in this file, edit the source and then run
+// 'npm run snippets'.
+
+// [START storage_emulator_connect_modular]
+import { getStorage, connectStorageEmulator } from "firebase/storage";
+
+const storage = getStorage();
+if (location.hostname === "localhost") {
+  // Point to the Storage emulator running on localhost.
+  connectStorageEmulator(storage, "127.0.0.1", 9199);
+} 
+// [END storage_emulator_connect_modular]
\ No newline at end of file
diff --git a/storage-next/emulator-suite.js b/storage-next/emulator-suite.js
new file mode 100644
index 00000000..78891a4f
--- /dev/null
+++ b/storage-next/emulator-suite.js
@@ -0,0 +1,14 @@
+// [SNIPPET_REGISTRY disabled]
+// [SNIPPETS_SEPARATION enabled]
+
+function onDocumentReady() {
+  // [START storage_emulator_connect]
+  const { getStorage, connectStorageEmulator } = require("firebase/storage");
+
+  const storage = getStorage();
+  if (location.hostname === "localhost") {
+    // Point to the Storage emulator running on localhost.
+    connectStorageEmulator(storage, "127.0.0.1", 9199);
+  } 
+  // [END storage_emulator_connect]
+}
diff --git a/storage-next/package.json b/storage-next/package.json
index a64d67b2..b1c449ab 100644
--- a/storage-next/package.json
+++ b/storage-next/package.json
@@ -6,6 +6,6 @@
   },
   "license": "Apache-2.0",
   "dependencies": {
-    "firebase": "^9.12.1"
+    "firebase": "^10.0.0"
   }
 }
diff --git a/storage/emulator-suite.js b/storage/emulator-suite.js
new file mode 100644
index 00000000..be1f2dd4
--- /dev/null
+++ b/storage/emulator-suite.js
@@ -0,0 +1,16 @@
+// These samples are intended for Web so this import would normally be
+// done in HTML however using modules here is more convenient for
+// ensuring sample correctness offline.
+import firebase from "firebase/app";
+import "firebase/storage";
+
+function onDocumentReady() {
+  // [START storage_emulator_connect]
+  var storage = firebase.storage();
+  if (location.hostname === "localhost") {
+    // Point to the Storage emulator running on localhost.
+    storage.useEmulator("127.0.0.1", 9199);
+  } 
+  // [END storage_emulator_connect]
+}
+