To be fair, some sites/things don’t work with Firefox, and keeping up with Chromium derivatives is a difficult task.

Hence most default to Brave. They got the SEO. They got the marketing money and socials hype.

You have to dig deep into the internet to find Helium, Vivaldi, Cromite, Ungoogled Chromium, or whatever the fork de jure is. And that’s if you miss all the scamware.