Firefox has been my browser of choice for years. I recently upgraded to their "fastest ever" - Firefox Quantum
I declined the FF quantum update because I didn't want what it offered but I use 2 laptops at home (win 8.1 and win 10) and a win 10 desktop at work and there was an annoying FF upgrade but not quanum anyway. I will NOT use anyhing other than Firefox for internet browsing. But Microsoft seems to be applying updates these past few weeks which is disasterous on all my computers, they're all running with problems and trying to override settings for any software back to Microsoft preferred and it's progressively more awful programs ("bing" for one for an internet search engine -good grief!!!!). At the moment one laptop won't stay switched off-again which is a symptom of an "update" and it's almost unusably slow.
I'm still a fan of Microsoft and would never go back to Apple -still riddled with it's own issues which users merrily overlook, but I just wish we could go back to XP days when everything seemed to work consistently!!!!
...as a software guy keeps telling me as software keeps getting "better" but works less well with each upgrade. It's called "progress" and we should be glad of it!!!!!!!!!!