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Firefox to become first mobile browser to support desktop extensions later this year
(blog.mozilla.org)
This is a most excellent place for technology news and articles.
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.
Apple on the other hand..
Sources:
It's sad to say, but the current restrictions on iOS are likely to be one of the last things holding Chrome/Blink back from total dominance. It's already the default on Android, and it's installed on most computers. So if a real Chrome ever shows up for iOS, web devs won't have any reason to test on Safari anymore. They'll tell their visitors to just download Chrome if it doesn't work on their iPhone or iPad.