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Testing the Firefox alternatives
(tommorris.org)
A place to discuss the news and latest developments on the open-source browser Firefox
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:
And many small things.