Mozilla cares about funding itself, yes. But digital advertising is also how most of the web is funded - and Mozilla cares about that, too, because it directly impacts everything else under the Mozilla mission.
As a user, you might prefer no ads when asked - but an enormous majority of people have endorsed the ad-supported free-of-charge model on the web through their daily actions. So, practically speaking, we have to find a way to deal with it and make it better.
As a user, you might prefer no ads when asked - but an enormous majority of people have endorsed the ad-supported free-of-charge model on the web through their daily actions. So, practically speaking, we have to find a way to deal with it and make it better.