But in this case they are damaging something especially valuable, one of the leading privacy and freedom organizations in the world, during a very dangerous time. (And also one that doesn't buy or organize an army of 'grassroots' support.)
Cui bono?
I think Mozilla has made clear that they use the data for things the user requests. If someone thinks otherwise, please quote the current language (not the language from two days ago).
They also are innovators in privacy-preserving advertising. Almost anything else on the web is much worse: it has ads and collects personal data. Not only does Mozilla not collect personal data, if they can create effective privacy-preserving advertising, they could transform privacy (again) by not only sharing this technology but demonstrating to government that the privacy violations are unnecessary for business profitability.
Yet people are throwing all that out for the energy and excitement of piling on. That's a really bad choice, as far as I can see. If that's not what's happening, why are almost all posts expressed that way? How about some reasonable, calm discussion?