So, it's been 2 days now that upon starting up Firefox on my MBP, I encounter the same problem. First, I'm prompted to put in my primary password. When I'm putting it in, the small window where I'm writing it reloads, and I have to start again with the password. The site is then non responsive. I have currently multiple opened tabs, and it's impossible to navigate, to open a new tab, a new window, to interact in any way. When I go to the top left under meny -Firefox - About Firefox - Submit Feedback or Firefox Help, a new tab does open, but I still cannot interact with it. I have to quit and reopen multiple times (third today) for it to work properly. Please help! Many thanks