firebase.messaging.getToken hangs forever in web browser. FCM requirements?

[DoumanAsh]

So in past I used FCM successfully with flutter (it was 8.10.0)
Recently I tried it again using 9.23 with *-compat version and unfortunately I have issues in web.

For some reason getToken promise never resolves.
isSupported returns true so I'm sure it is not browser issue, but it is not clear what else could be wrong as the only difference I can see is that my past prototype had measurementId in firebase config, but otherwise it works just fine.

So my only conclusion is that there is some requirement I'm missing.
Anyone has any idea what could messaging require aside from special API key for web push notifications?

It seems to hang after attempting to subscribe to pushes
https://github.com/firebase/firebase-js-sdk/blob/114bc6eedc9c28d155660cd6b6ff532ae98e6d9c/packages/messaging/src/internals/token-manager.ts#L164C10-L164C10

[DoumanAsh]

It turns out that the problem was me not using Chrome browser.
Unfortunate but it seems not every chromium derived alternative is suitable for FCM