[shawnz]

I don't think this would be the best thing to do for uBO users. This creates the possibility that the "Firefox internal uBO" could diverge in functionality from the one maintained by gorhill and get neutered by Mozilla managers.

I think it is ultimately necessary due to the incentives at play that the adblocking technology can be delivered by any third party.

[handrous]

If other major browsers are cutting off critical functionality for it, the concern may be moot.

As long as Mozilla aren't themselves in ad sales/brokerage I wouldn't be worried about a browser shipping an ad-blocker, as far as incentives go. Google doing it, that'd be concerning. Mozilla? Good.

[EDIT] though actually this is another case of their relationship with Google being kinda crippling, since that does introduce a conflict of interest... which is part of why Google does it, I'm sure.