Web apps need a parallel layout engine, and such a thing exists with Mozilla’s Servo, but they’re for some reason Mozilla using it for WebVR rather than building a functional browser.
I don't think there's that much wrong with "Gnome Files". That should be enough to search for help, and also gives information about what the program does. Similarly, I would say the names should be "Firefox Browser", "Geary Email" etc (if we're aiming to be user friendly).
I really don't see how distrowatch indicates anything, why would people using a system go to that site in particular? The latest wikimedia statistics from the middle of 2015 have: