In the coming months Mozilla will launch support for an open ecosystem of extensions on Firefox for Android on addons.mozilla.org (AMO). We’ll announce a definite ...
Didn't Apple announce that they were going to remove restrictions on 3rd party browsers on iPhones and iPads? You might be seeing a Gecko based Firefox soon.
I doubt they'd limit it by country, but the question of how soon is very valid. It's one of the reasons why I don't use Apple products. Their stranglehold over the ecosystem is highly annoying.