There are many ways, one way that likely will not work for FireFox either is to charge for the Complied version with a packaged installer. So while the source

There are many ways, one way that likely will not work for FireFox either is to charge for the Complied version with a packaged installer. So while the source is open, and if you know how to compile it you can do so yourself, most people and businesses are lazy and will just pay a few dollars to have someone else do that. The problem is Edge and Chrome are free already so charging for a compiled browser is probably not going to work