Ok first I have used the searchbar and got nothing.
Whenever I try and open Firefox I get a little window poping up that says "Firefox is aldready running, but is not responding. To open a new window, you must first close the existing Firefox process, or restart your system." The problem is that I don't have any Firefox windows open. I have tried to restart my computer, same results. I've tried re-installing it and that didn't work.