Firefox has been my primary browser for around 15 years. I'm also a Thunderbird user. Yeah, I have not liked some of the changes but I roll with them. Biggest reason I stick with Firefox is there's an extension to put the tabs on the left as a tree (Tree Style Tab by Piro). My work flow has me keeping a LOT of tabs open, and they get unreadable up top. I think Chrome finally got side tab functionality recently, I heard. Only other extensions I use are uBlock Origin and CSS Exfil protection. Less is best when it comes to extensions, both for performance and security.
I use Brave for my Google accounts only, with the same two extensions as mentioned above. This just stays open all the time with Contacts, Calendar, Gmail, Maps and SMS open, synced to my Android phone account. I don't use it for browsing, just for Google Android services.
Chrome is installed, but basically as a backup for pages that don't like to print properly from Firefox, or the rare page that occasionally has some java code that doesn't play totally nice with Firefox.
I do use Chromium Edge on my Surface tablets. It's by far, the best touch screen browser experience. Also running the same two extensions as I run on Firefox and Brave.
I would hate to see Firefox go away, not just because it's my primary browser (to be honest, I could learn to live with a Chromium based alternative), but mainly because it's not a good thing that almost all the other browsers out there are built on the same (Chromium) engine, and thus share any common flaws.
- "Great spirits have always encountered violent opposition from mediocre minds." - Albert Einstein