I use Firefox for Linux when sites refuse the privacy settings that Waterfox imposes. This means Sainsbury's, Tesco, the Nationwide, ebay, Waitrose, and Barclaycard. I have hundreds of bookmarks for Waterfox under Linux. I back them up whenever I remember to.
Waterfox is security-driven (it deletes cookies when you leave the site, rather than at the end of the session), is faster than Firefox, and is 100% stable. Give it a try. It's free (at least under UNIX/BSD/Linux).
If I'm denied access to a site, typically Russian ones, I use Tor Browser. This is even slower than Firefox, but penetrates everything except the Great Firewall of China. I can't read Chinese, I can read Russian, so this is fine for me. I get to read the dissident sites. A lot more Russians are against the war than you might think from Western media.