At least for me (Linux, Wayland) it is literally unusable, due to this bug[1] and related issues in the comments. I finally stopped putting up with it and switched to Chrome this year, after being a loyal user since the browser was called Firebird.
In retrospect I should have jumped after Mozilla ruined Firefox on Android.
In retrospect I should have jumped after Mozilla ruined Firefox on Android.
[1]: https://bugzilla.mozilla.org/show_bug.cgi?id=1789602