Firefox locked up while working on Ancestry.com. The first time it was incredibly sluggish and I closed it and restarted and it was fine for a while. Then again later it started bogging down again. This time it locked up. I couldn't restart the computer because it said Firefox was still open. Finally caused it to force quit and restarted my computer. Upon trying to open Firefox I started getting all the messages about having crashed, reporting it, etc. It also asked if I wanted to refresh or use in Safe Mode. I told it to refresh. It finally told me that I had no profile and would not open. I used and app cleaner and totally removed Firefox. Now I try reinstalling it, and won't even allow me to reinstall. I get to the point where I drag the Firefox logo onto the application folder. It acts like it's going to move Firefox to the applications folder but then bounces back incomplete. I see the drive on my desktop. Double click and it just reopens the window for me to drag the logo to applications. I simply cannot reinstall Firefox now.