I can confirm that the problem persists even on Firefox 106.0.5 (64-bit), running PlexMediaServer-1.30.0.6359-1185e28d9-universal on a Mac mini (Late 2012) with macOS Mojave (10.14.6).
I can confirm that the problem persists even on Firefox 106.0.5 (64-bit), running PlexMediaServer-1.30.0.6359-1185e28d9-universal on a Mac mini (Late 2012) with macOS Mojave (10.14.6).