Plex error s4032 with firefox and fedora 31

After installing Fedora 31 I had some issues playing movies from Plex with the following error message: plex error s4032 (manifest) IĀ solved the issue buy activating the RPMĀ Fusion repositories: sudo dnf install{free/fedora/rpmfusion-free,nonfree/fedora/rpmfusion-nonfree}-release-$(rpm -E %fedora).noarch.rpm and installing ffmpeg compat libs: sudo dnf install compat-ffmpeg28 ffmpeg-libs