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 ...
That's nice, maybe they can finally re-enable about:config in the damn thing too. They removed it from mobile Firefox years ago and the lack of it aggravates the hell out of me.
If you have enabled the sync feature in Firefox, it seamlessly works with Fennec; as does the integration between Fennec and Firefox Desktop. Simply log on with your Firefox account in Fennec, and you won't even feel the difference.