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Why is compact mode 'not supported'?
(lemmy.ca)
A place to discuss the news and latest developments on the open-source browser Firefox
Eh, it seems to work on mine? I have my tabs set to a specific width, so perhaps that's helping.
Hmm, for audio playing, they do then show a speaker icon in place of the favicon, if that's what you're seeing. In the non-compact tabs, it also says "PLAYING" underneath the tab title, though. And I believe, it also shows a similar text for when the microphone or camera is in use, and they don't have icons for those...