Fórum podpory Firefox

Firefox on Windows keeps telling me that my tab has crashed every time i open a new tab. I have tried turning off all my extensions and add-ons, clearing the cache and cookies, turning off hardware acceleration, reinstalling the browser, clearing the appdata files and finally removing any and all firefox files in mozilla folders i could find on my computer, but nothing works. Strangely enough it works only when i open it in troubleshooting mode, even though I've reinstalled the browser 4 times now. It was working just fine earlier, but when i turned on my computer it would not work. The only thing i did in between it working and not working was play a videogame on Steam. Please help, this is driving me crazy. I am using an MSI 64-bit laptop and the latest version of Firefox 64-bit.

Windows 10 pc can not start,I have gone through automatic repair and diagnostics steps,but am now on advamced options and think I need to Reset it.This will lose Firefox.When I install it again will I be able to sign into my Firefox account to retrieve bookmarks and passwords?I am very nervous about this,don't even know how to install Firefox,as someone gave me the computer and it was already in there. I am a tech dinosaur!Thank you in advance for any help.Lesley