I don't see how it's conspiracy theory. Firefox has done exactly this over and over again. (The latest example that annoyed me: browser.proton.enabled =false)

As a user of Firefox, I feel like I'm in a constant battle with Mozilla/FF to disable every new bad idea they have. Every time I'm forced into a surprise update I didn't ask for/try_to_install, something gets worse. This isn't an unusual state for commercial software, but Firefox is supposed to try to not be commercial.