Firefox lock file
While playing with a symbol bar code scanner on my system it caused a few things to crash, one of these things was Firefox. When I would try and restart firefox it would always come back saying my profile was in use. I have seen this problem before and knew to delete the lock file located in ~/.firefox/profile/lock. (on windows I guess this would be a diff location and called parent.lock?). Anyhow just seemed like something handy firefox users might like to know.
