Out of nowhere, Firefox started taking forever to open... sometimes as much as 45 seconds - 1 minute. Frequently it will suddenly not respond to links on a certain page, often involving desirable pop-ups that have worked in the past. If I click multiple times, sometimes I am later (more than 5 minutes) besieged by multiple pop-ups, although they rarely display correctly. Sometimes the back button won't work. If I quit Firefox, it sometimes takes forever to close, or the window will close, but the app will still be open. I've tried disabling add-ons, and opening in safe mode, etc. Any ideas? Thanks for your help. == This happened == Every time Firefox opened == It felt like it.