Do you have Kde plasma integration extension working on Firefox flatpak ?
KDE
KDE is an international technology team creating user-friendly free and open source software for desktop and portable computing. KDE’s software runs on GNU/Linux, BSD and other operating systems, including Windows.
Plasma 6 Bugs
If you encounter a bug, proceed to https://bugs.kde.org/, check whether it has been reported.
If it hasn't, report it yourself.
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Developers do not look for reports on social media, so they will not see it and all it does is clutter up the feed.
Yep, I do, as well as all permissions
IIRC this extension just doesn't work in Flatpak. You need to use Firefox outside of the sandbox, installed via package manager or official build from Mozilla.
It worked fine for years tho?
That's the reason I asked OP...
Can you change the play/pause status from the icon that shows up in the menubar in plasma? If not then the plasma Firefox integration is the issue.