Firefox has been doing a few rather questionable things. They had the Mr Roboto add-on which was pushed out to advertise a TV show, they stuck ads in the "Recommendations" [1], they proactively destroyed peoples' bookmarks when they dropped support for RSS, they dropped support for RSS (because, apparently, a decentralized way to track website updates is anti-Google), and they destroyed a lot of useful add-ons.

I basically can't trust them anymore.

[1] https://www.theverge.com/2018/5/7/17326184/firefox-ads-spons...