Hi! I've recently (within a week or so) had this problem where I have a youtube video paused on one tab and while browsing another site on another tab the youtube video unpauses and continues to play the video. This happens continually and so I have to either mute the video or close the youtube tab so it doesn't distract my browsing. The problem stops also if I refresh the youtube page. Firefox version 85.0 (64-bit) Linux Mint 19.3 Tricia MATE