These "missteps" are the reason I don't use Firefox. With Chrome, I know Google are watching. But I also know only Google are watching. They're not bundling irremovable third party apps in with the browser, or installing extensions without my consent, or sending my entire browsing history to another third party.

Mozilla have done all these things, and when called out on it, they don't seem to realise they've done anything wrong. That crosses the line from naive to actively malicious.