What breed of fire-breathing dog do we have here?

Good to know, thanks for sharingn Glad to hear you’ve found a solution.

I have noticed a similar behavior on one of my machines recently. Usually it’s a video (or recently played Spotify song) that gets ‘stuck’ there. Have you tried opening a new instance of Firefox, playing a video, then lock the computer (win + L) to see if it- at the very least- changes/updates to the newly opened video?

Non potato version

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