Firefox Problems

Problem: I'm having a problem launching Firefox in Linux. It says I already have a Firefox browser launched and I need to fix that before being able to launch another one.

Solution: In your user space directories you find one of the two following folders:

~/.mozilla/firefox/*.default/ 
or 
~/.mozilla/firefox/*.<your netid>

In one (or both) of these directories you will find a file called .parentlock

You need to delete this file. For some reason it wasn't deleted.