Firebase Auth with Firefox Web Extension Add On

Question

I am creating a web extension both for chrome and firefox. I have integrated firebase UI and firebase auth. Google authentication works well on chrome extension. But on firefox extension/add-on it gives me the following error.

This operation is not supported in the environment this application is running on. "location.protocol" must be http, https or chrome-extension and web storage must be enabled.

I tried couple of things, but none worked.

1. Tried adding moz-extension://dhhjsbhjbajnsabjajbasjbhjasjh in authoirsed domain in firebase auth console. Validation error.
2. Tried both pop up and redirect sign in methods.

Similar issue is faced by other developers while developing for cordova or ionic

Answer 1

Firefox extensions are not supported by Firebase Auth. You can file a feature request for this.

In the meantime, you can sign in the user via a popup opened from the extension and then CORS postMessage the result to the extension, making sure you check the origin of the extension before you do so. For example, assuming you are signing in with an OAuth provider, open a popup you own, sign in with Firebase, then pass the OAuth access token to the extension and then signInWithCredential from there.