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Mozilla tells extension developers to get ready to finally go mobile
(www.theregister.com)
This is a most excellent place for technology news and articles.
They only allow a handful of curated extensions on mobile. You'll have to use the nightly build and jump through some hoops to install arbitrary extensions on mobile (mostly to allow devs to test their extension). Looks like they'll finally lift the restriction soon.
It's also worked on beta builds for some time now as well. Which is nice since you only get prompted to update every now and then instead of daily.