[FireInsight]

Android Firefox versions that are geat as well - [Ironfox](https://github.com/ironfox-oss/IronFox): Hardened - [Fennec](https://f-droid.org/packages/org.mozilla.fennec_fdroid/): Fully FOSS

[MarsIronPI]

Oh, I've always used Fennec; does the main Firefox Android build not support extensions?

[JoshTriplett]

Firefox for Android supports extensions just fine. I use Firefox with uBlock Origin as my only browser on both mobile and desktop, and use Firefox Sync to send tabs between them. I literally disable the preinstalled Chrome on Android.