Yes. The Firefox website should ideally provide some instructions - including a way to open the Firefox entry in the Ubuntu/Gnome Software Center, instead of giving users a tarball most don't know how to handle (and if they do know how to handle it, is not necessarily what they're looking for). The tarball should of course still be available as a download option, but almost all interested users (yes, even the technical ones) should use their distribution's package manager.