I am running Mac OSX 10.5 and have never had issues with firefox. Then I noticed it starting to run much slower and having issues freezing, yet if I used safari there were no problems. I decided to uninstall firefox and all of the folders that go along with it to get a clean restart with a new download. Everything seemed to download fine, but when I attempt to open firefox it just opens a warning that says "a copy of firefox is already open" and my only option is to close the program. Yes, I have quit ALL applications and even restarted the computer to make sure nothing is running first. This may be completely unrelated, but another issue nonetheless, shortly before I started having issues with firefox, it no longer would go to the hotmail login page to check my email. I didn't change any settings, but it would not load that webpage even though every other page works fine. I know it is not a problem with the hotmail site because every other computer in my home will go to the site and login, plus I can get into my email by going to MSN and logging in from there.