Why is Firefox/ Thunderbird telling me "already running", "profile in use" or "No running window found"?
UNIX
First, check if you have firefox/thunderbird instances running:
ps -ef | grep <username>
Kill these with kill <pid>
- Delete the following files:
~/.mozilla/firefox/<profile-name>/lock
~/.mozilla/firefox/<profile-name>/.parentlock
Windows
- Check with the task manager if firefox/thunderbird is running, if yes, kill it.
- Delete the following file:
W:\Application Data\Mozilla\Firefox\Profiles\<profile-name>\parent.lock
Mac OS X
- Check with the Activity Monitor if you have any dead firefox processes still lingering around. If so, kill them (Button labeled "Quit Process").
- Delete the following file:
~/Library/Application Support/Firefox/Profiles/<profile-name>/.parentlock