I have a similar issue (let me know if I should open a new bug):
launching firefox for the first time (ie. while it's not running) works
fine. But, once it's running, any further invocation of firefox fails
with the "Firefox is already running..." dialog - for example, clicking
on a url in a
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
Removing the snap and reinstalling solved the issue for me. Still I
wonder why it occurred first hand.
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https://bugs.launchpad.net/bugs/1954413
Title:
firefox snap cannot be started:
