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.
This is how the relationship is with them. I moved on 10 years ago, they fought my every step, e.g. suddenly exporting from Drive didn’t work.
Like all toxic relationships, you’re better off without them.