document.fonts.keys() is not iterable on Firefox

[EffakT]

Description of the bug

The recent change to ensure all resources are loaded before mount causes a bug in Firefox, as document.fonts does not return an Iterator in Firefox, rather a FontFaceSetIterator.

See below bugreport @ Mozilla
https://bugzilla.mozilla.org/show_bug.cgi?id=1311198

There is a potential fix by Sidney Liebrand
https://sidneyliebrand.io/blog/fixing-font-face-set-entries-not-iterable-in-firefox

Steps to reproduce

Load current release in firefox

Expected behavior

Page should load

Logs

No response

Screenshots

No response

Platform

macOS

Browser

Firefox

Jellyfin server version

10.9.2

Additional context

No response

[ferferga]

What a bad joke... 😓

There was a reason why that branch wasn't merged yet, not only because it's unfinished, but for testing it properly. Thought this change would be harmless and since I'm on vacation just with my laptop (no Firefox installed) just omitted checking it completely.

I'll try to open a PR later today. I'm really grateful for all the investigation work you already did, definitely makes things much easier! 🙏🏻