Ubuntu Firefox it is saying that it is already running but not responding

On Ubuntu, When trying to open Firefox it is saying that it is already running but not responding. I am on a system where I dont have access to view the root. I have had this issue before and fixed it but I dont remember how. I know before I had to delete a file but I dont remember what or where.

Answer

It's probably that your profile is locked; happens on unclean shutdown sometimes.

See this support page on Mozilla.com, specifically:

• pkill firefox (or restart your computer). Don't try to start Firefox.


• Go to your Firefox profile folder - see How to find your profile.


• Delete the lock file parent.lock

Your profile is in ~/.mozilla/firefox/*.default/ (the * will be a random sequence of 8 letters)

rm parent.lock and try again.