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Firefox will support at least 200 new extensions on Android this December
(www.androidpolice.com)
This is a most excellent place for technology news and articles.
Wait, it's not? Iceraven has it.
Unfortunately not. Firefox Beta/Nightly has it, just not the official android-build. They don't want to expose it to the user for some reason, but appearently it's still fine to do it on the official pc build.