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Firefox for Android now supports over 450 add-ons
(www.ghacks.net)
This is a most excellent place for technology news and articles.
It is, but only if you go on the main website, and not the android sub category https://addons.mozilla.org/fr/firefox/addon/cookie-autodelete/
But then that is for desktop Firefox, not mobile. Right?
https://addons.mozilla.org/en-US/android/addon/cookie-autodelete/
It will allow you to add it to mobile firefox it seems, maybe it just didn't get categorized correctly?