Firebase Auth errorFirebase Auth: auth/cancelled-popup-request

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Why the popup is cancelled, and the fix

1. 01

   The user clicked twice

   “This operation has been cancelled due to another conflicting popup being opened.” Firebase JS SDK, Firebase JS SDK auth errors (cancelled-popup-request)

   A second click opens a new popup and cancels the first call. Disable the button until the call settles.

   let signingIn = false;
   async function signIn() {
     if (signingIn) return;
     signingIn = true;
     try {
       await signInWithPopup(auth, new GoogleAuthProvider());
     } catch (error) {
       if (error.code !== 'auth/cancelled-popup-request') throw error;
     } finally {
       signingIn = false;
     }
   }

2. 02

   Sign-in starts from code that runs twice

   “Only one popup is ever shown at once.” Firebase JS SDK, Firebase JS SDK source: popup.ts

   React StrictMode runs effects twice in development. Start popups from a click handler, not from an effect.

3. 03

   The app shows the error to the user

   The cancelled call is not a failure the user needs to see. Treat this code like a no-op and wait for the newer popup’s result.

4. 04

   A different popup error is the real one

   Also check: if no popup opens at all, the browser blocked it, which is auth/popup-blocked. If the user closed it, the code is auth/popup-closed-by-user.

Checked against the vendor’s docs on November 9, 2026: Firebase JS SDK source: auth errors; Firebase JS SDK source: popup.ts; Firebase docs: Authenticate using Google with JavaScript.

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Related: Firebase auth/popup-blocked · Firebase auth/user-mismatch · Firebase auth/unauthorized-domain · Firebase auth/network-request-failed