When I install the latest Firefox update, Firefox starts hanging and running slow. This only happens on my home computer (an HP desktop computer running Windows 10). Recently I had a lengthy screen-sharing session with a Geek Squad agent. We did a clean uninstall and reinstall of Firefox, as well as deleting any old security software I'm not using. None of that helped -- Firefox still runs slow, hangs and crashes. Anyone out there have a clue as to WTF is going on?