I also use Firefox, as a secondary browser, but the only reason I share with the author is Mozilla's independant web engine. My main reasons for sticking with F

I also use Firefox, as a secondary browser, but the only reason I share with the author is Mozilla's independant web engine. My main reasons for sticking with FF are that I'm distrustful of Google's policies and that I'm influenced by decades of free software lobbying at Mozilla. And the exclusive extension Tree-Style-Tabs, even if it's unstable. I disagree with most of theirs arguments in favor of Firefox. > 1. The about:config page Even Mozilla does not recommend this. The settings on the about:config page are undocumented and can disappear or change their behavior with any new release. I used to set a line in "about:config" so that FF always asked before quitting. It stopped working. I checked Firefox's wiki, nothing new. I had to read the source code to understand that the setting was now meaningless: its value was ignored when the setting "restore session" was enabled. The code had evolved, but it was not reflected in the UI. I don't understand why each setting in about:config doesn't have an embedded description. > 2. Mozilla cannot decrypt my data on their servers Same with other browsers, e.g. Vivaldi. I agree with 4, but I don't care/use 3, 5, 6. I've met a few sites where Firefox was not welcome (e.g. Jitsi meeting with screen sharing), so I would make it my primary browser only if there was a very strong incentive. But they're too similar to Chromium. Vivaldi with vertical tabs is more stable than Firefox with TST, so I won't switch any time soon.