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 ...
As an iOS user and long time Firefox user (never switched to chrome in my life) I feel jealous. But one can only hope that we too in the APPLE walled garden won't be left behind. Though I understand that it would be a long shot. :(
Apple doesn't allow extensions to be distributed outside of the AppStore and Firefox on Android is based on WebKit anyway because neither do they allow third-party browser engines. So I wouldn't hold my breath.
I've been running Firefox as my default browser on my phone since 2018 without webkit. Even other apps opens their links with geckoview.
It started with FF Focus, shortly after FF Preview, then FF beta and since last year FF for Android.