Forks are pretty valuable to Firefox development, and it’s helpful for Firefox marketshare too because they use the same UA as Firefox, so website must support Firefox.
Even Firefox devs said they observe Firefox forks to see their idea and bring back to Firefox, just compare recent new features of Firefox to Zen/Floorp, you would see that the idea of:
- Profile Manager is from Zen/Floorp
- Vertical Tab is from Zen/Floorp
- Sidebar is from Zen/Floorp
And many small things.
Reinstalling is waste of time, just let you know because the settings are kept, so nothing changes, issues remain.
Just create new profile.