Doesn't work in Brave browser

[MrHaroldA]

> chrome.identity.getAuthToken();
Unchecked runtime.lastError: The user turned off browser signin

More info: brave/brave-browser#7693
See firebase/quickstart-js#419 for a cross-browser solution.

[rudiedirkx]

Sounds like a PR!

But I'm afraid to submit a new version to the Chrome Webstore, because Google started declining extensions, and even taking them down. That won't happen without new version submission, so it's safer to do nothing.