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Mozilla tells extension developers to get ready to go mobile • The Register
(www.theregister.com)
This is a most excellent place for technology news and articles.
I replaced the YouTube app on my SO's phone with a Brave Browser YouTube link (Brave includes both features out of the box) because having to sit through ads when they wanted to show me a video was driving me nuts...
I use Firefox because of tamper monkey, buy Brave is my go to easy solution for friends so I don't have to explain about installing extras.
You dont need tampermonkey for Ublock Origin and Video Background Play Fix. It's under add-ons when you go to settings.