Firefox is a great browser. Mozilla is outdated.
With all the kiddie phones, pads, etc. etc. now the Medium isn't the Message anymore, the message is IN the medium...imbedded, sold and bought in hypnotic flashes of targeted ads to a generation who wouldn't know a 360 from a punch card (forget about DARPA). So what has happened is this baseline has switched so far afield from the things that firefox can do...Adblock, NoScript and others, so that from an early age the newest users are convinced their way, that is the way they are sold, is the best.
Firefox needs a mobile browser that becomes the killer app, with killer apps. Then the Apple store and the Amazon store and the Google store will have a harder time paying off the developers who make the adds stop blaring.