Firefox for Android Support Forum

I have a Shokz headset with volume and pause/play buttons. I watch videos on my Samsung s21+ using Firefox (more privacy, and easier to have multiple videos up with tabs comparedto YouTube app.

It worked fine up till today, when the pause/play button no longer does anything. I tried restarting the phone, closing and opening the Firefox (Ff) app, force-stopping the Ff app, and turning the headset off amd on. The headset functions correctly in other apps, just not Ff.

I don't want to uninstall and reinstall Ff if I can avoid it, but would that even work? I've done all I can short of that, but it still doesn't work.

Steps to reproduce:

1. Have "Video Background Playback Fix" addon installed
2. Open a video on Youtube
3. Lock phone (video keeps playing)
4. Wait ~5 minutes

Actual results:

1. Video stops playing after ~5 minutes
2. Unlocking the phone resumes video

Tried rebooting phone and reinstalling the VBPF addon, also tried reinstalling Firefox, these did not fix the problem.

Expected results:

1. Video should keep playing in background

In addition to the above, playback controls are no longer shown for Youtube in the notification area. They still work for other media, eg. Soundcloud.

This used to work for me in the past few years. Phone is on Android 10, I have not updated it or changed any settings recently.

(Reported as https://bugzilla.mozilla.org/show_bug.cgi?id=1827045 , but maybe this is not a bug but a hidden setting somewhere that I accidentally changed?)