Could it be that you had an instance of the firefox deb (or another upstream
build) running?
If so, firefox might be trying too hard to detect whether another instance is
already running, but I suppose it's by design.
Good to know that you managed to resolve the issue anyway. I'll close
this bug, feel free to re-open if it happens again. Thanks!
** Changed in: firefox (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1954413
Title:
firefox snap cannot be started: firefox already running
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