I use Fennec for Firefox. Fdroid can then do updates. I disabled Play Store and Services. plugins work on Fennec.
For reddit, try old.reddit.com with Vivaldi. It is chromium based so works on sites with chrome/blink bias, but also has built-in adblocker (needs to be turned on in prefs). For me, old reddit font scaling is better on Vivaldi than Fennec.
We need them pointed at every tech CEO constantly.