@Maholmire They're all really terrible. I am using a build of Seamonkey that I stripped all the Telemetry out of and I still had to disable about a million things, I have a similarly patched very old Firefox and a new-ish Firefox that I compel to stay in a box, all of which talk through Tor. lanodan maintains badwolf, https://hacktivis.me/projects/badwolf , which I haven't tried ("building Firefox" is a non-trivial undertaking) but since lanodan is very cool and has the right approach to security/privacy, I have been meaning to try. (It seems preferable to maintaining my own ad-hoc gutted patches.) A bonus of badwolf is that Pleroma definitely works if you can see lanodan's posts.

Aside from that, half the time I use mothra. I'm gradually kind of gravitating from "Use the weird browser when the CSS/JS get annoying" to "Use the regular browser when the weird one doesn't work" because mothra is much faster.