Introducing the Promoted Add-ons Pilot | Mozilla Add-ons Blog
Not a huge fan of this. Taking money to evaluate extensions means people or teams with less resources aren't going to be able to reach as many people as before. And putting a caution label on extensions that Mozilla hasn't approved is just as bad. So even when smaller teams get their extension in front of people, Mozilla is going to warn them off. Extensions are the biggest thing Mozilla has going for them in the browser space. Narrowing their usefulness is just going to annoy large parts of their remaining userbase.