uBlock Origin is already a bit nerfed on Chrome, and will likely be completely gone in the near future. That's Firefox's killer app for "regular" users, and power users too.

It's a matter of getting the word out. Mozilla likely won't outright bundle its features as to not completely alienate Google, since they are their main source of revenue, but seem to be okay with promoting it otherwise, as it is on the front page of addons.mozilla.org and was the first extension (and the only one, for a time, and still only one of nine) supported in the new Firefox for Android.

There are also "normal" users who do not care about blocking ads and tracking, or do not know about the performance issues, malware risk, and other reasons for using a blocker and have not made such a decision, trusting the browser to act in the best interest of the user. (We know that last bit doesn't work anymore.)

(Regarding uBlock Origin, gorhill has expressed that he will not neuter the extension to work with Chrome's API change, reference: https://github.com/uBlockOrigin/uBlock-issues/issues/338#iss... )