Sounds like one of those Why Waa Waa questions. There’s currently only six browsers listed, at the moment. It’s not some all inclusive thing.
Where’s Fennec, where’s IronFox, where’s WebLibre, where’s Cromite or Helium or Tor Browser or or…?
Give these kinds of lists and the organizers time to check and test things or get additional feedback.
NsCDE on several OSes.