I don't think enough users care about a lot of the values offered by Firefox, and simply use whatever is the default or what most people they know use. If anti-competitive laws force vendors to provide users with a choice, I think this could hopefully give Firefox more of a fighting chance. I think it's important there are options like this that exist, even if they are small, because they provide for the needs of Tor Browsers users for example. Where there are no other browsers that match the anti-fingerprinting features that Firefox offers and which Tor users require.