A feature I tried to found via extensions was a pop-up for videoconferences like Opera browser has, you go to Google Meet and you can detach the call and have it pinned on top of what you are doing, you can drag the window, see shared screen, mute/unmute, video on/off, change settings and drop the call, Opera uses an internal plugin, so I couldn't find a functionality like that on addons.mozilla.org/ but seems very similar to the YouTube pop up plugin.
https://www.opera.com/features/video-pop-out
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