[doe88]

Why don't Mozilla make or use such engine in its browser? Make something really native for dealing with ads and annoyances. The irony is Brave smartly uses Rust which were forsaken by Mozilla. I know Mozilla seems to have something for ads but honestly I don't even know what it really does, beside its shield icon.

[gkbrk]

Almost all of Mozilla's money comes from Google, an ad company. Mozilla wouldn't want to bite the hand that feeds them.

[Foriney]

Mozilla wants Firefox to be a mainstream browser that anyone can use. Ad blocking introduces the risk of site breakage, and the majority of the population don't have the knowledge to deal with it.

This is what Firefox blocks by default: https://support.mozilla.org/en-US/kb/enhanced-tracking-prote...

[viraptor]

Because Mozilla is mostly sponsored by Google.

[snowram]

Because ad blocking isn't provided by default in Firefox. It isn't as opinionated as Brave, for the better and the worse.