I honestly want to ditch Firefox and try a Chromium browser for a minute [1], but I'm stuck on Firefox because it's the only one with a killer feature: send a tab to/from iOS and my Linux desktop.
I skip Chrome and Edge for privacy reasons, Brave have a crappy and buggy sync feature that I don't know what OSes it supports, but not my combination. Can't send tabs with them. Vivaldi doesn't have an iOS port. Impossible to do with Chromium.
Firefox can send tabs to all my machines, and I use that feature multiple times daily, such as finding a cool article while I'm sitting on the couch and sending it to my desktop so I can read it later. Mr. Eich, if you're around here, please please fix syncing tabs in your browser, it's the only thing stopping me from switching honestly.
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1: I quite like Firefox, but it's in a dying spiral, and I'm starting to see broken sites. The Web is such a complicated nightmare "protesting" won't change anything, and forking neither, because it's too bloody complex. Chromium has won. Our only hope is Mozilla takes their head out of their arse and start working on their browser instead of faffing about and making small, meaningless changes every release, but I don't see that happening any time soon.