Firefox Already Running
If you get this error, it generally means firefox exited without removing it's lock files. You can do the following to fix is s
First, make sure you're not running firefox and kill them if you have any (note, there may be other users running firefox, this is not a problem and is irrelevant to this error:
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ps -x | grep -i firefox killall firefox |
Then look for any lock files and remove them.
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cd $HOME find .mozilla/firefox -name "*lock" -ls |
Use the rm command to remove the files.