this is an article from (imo) one of the best privacy/security tech-blogs out there
it's in German, but you can probably run it through Firefox local translate
https://www.kuketz-blog.de/lineageos-weder-sicher-noch-datenschutzfreundlich-custom-roms-teil4/
From their FAQ it's great and covers a lot of questions better than I ever could):
What is AdNauseam's performance like? Will it speed up or slow down my browsing? AdNauseam is significantly faster (and safer) than using either of the two most popular blockers, Adblock or Adblock Plus, and nearly twice as fast as using no blocker at all. Metrics with more browsers and adblockers on the way...
Why not just work on improving Briar?
qweertz
joined 8 months ago
Maybe CalyxOS would be a better fit then?