You could try disabling the new integration with Windows' media interface. That would be similar to the advice you found for other applications:

(1) In a new tab, type or paste about:config in the address bar and press Enter/Return. Click the button accepting the risk.

(2) In the search box in the page, type or paste mediakeys and pause while the list is filtered

(3) Double-click the media.hardwaremediakeys.enabled preference to switch the value from true to false

If Firefox already started integrating with Windows, and closing the tab doesn't break the connection, you probably need to exit and restart Firefox for that to release.

It worked ! I tried it previously but forgot to restart firefox in my frustration...

Thank you a lot !

You could try disabling the new integration with Windows' media interface. That would be similar to the advice you found for other applications: (1) In a new tab, type or paste about:config in the address bar and press Enter/Return. Click the button accepting the risk. (2) In the search box in the page, type or paste mediakeys and pause while the list is filtered (3) Double-click the media.hardwaremediakeys.enabled preference to switch the value from true to false If Firefox already started integrating with Windows, and closing the tab doesn't break the connection, you probably need to exit and restart Firefox for that to release.

MY GAWD! Thank you so much. I've been having this problem for months, ans searched and searched trying to find a solution. Today I thought I would search again, and here it is--finally!

Man, this really breaks Bluetooth when you are trying to listen to music in the background. It should not mute BT when a video is stopped or comes to an end.

BTW, Chrome has the same problem, and so does Brave. Saw a fix for Chrome on Google hep pages, but nothing for Brave.

Omg finally I have found a fix! This has been driving me crazy as I just bought myself some BT headphones during the holidays. Thank you so much @jscher2000!!!

Much appreciated!

You could try disabling the new integration with Windows' media interface. That would be similar to the advice you found for other applications: (1) In a new tab, type or paste about:config in the address bar and press Enter/Return. Click the button accepting the risk. (2) In the search box in the page, type or paste mediakeys and pause while the list is filtered (3) Double-click the media.hardwaremediakeys.enabled preference to switch the value from true to false If Firefox already started integrating with Windows, and closing the tab doesn't break the connection, you probably need to exit and restart Firefox for that to release.

THANK YOU SO MUCH. This has been a major source of frustration for me - finally solved. Very grateful for your solution.

This started happening to me around 6 months a go. This solution worked like a charm, for a long time i was blaming voicemeeter banana for it. The solution for Spotify also works fine.