It seems that Firefox is a dying browser, due mostly to their own decisions about things. I switched to Brave about six months ago and am completely happy with it. I did disable the Rewards and Wallet functions immediately, and I disabled the sponsored ads as well. Fortunately, those are easy things to do. I can't think of a website that Brave wouldn't open, but if I find one, I'd open up my de-Googled Chromium browser.
If browsing privacy isn't vital to someone, there's Vivaldi, Opera, regular Chromium, or even (gag) Chrome, besides Firefox. Most Linux distros still come with Firefox as the default. When I test a distro, I'll open FF and sync it just to get all my bookmarks and stuff loaded up, and then load Brave to import them. Brave also has a sync function, but I have to enter a 24-word key to use it. Simpler to just import from FF.
