Note that you've been able to use custom collections to get extra extensions on FF-for-Android for a while provided you put the browser into developer mode firs

Note that you've been able to use custom collections to get extra extensions on FF-for-Android for a while provided you put the browser into developer mode first. It's a pain in the arse and certainly doesn't count as 'released' by any means but it's been at least just about possible for a while.