They're the things we carry with us, the things that make us who we are. If we lose them, we lose ourselves. I don't want my pain privacy taken away. I need my pain privacy!
I've seen this sentiment, but I don't think it's credible. I don't think we should normalize legalese that explicitly enables bullshit; it's not like it couldn't be written any other way. It's written in English, though it has legal intent, and we have words and phrases to clarify such things.
No, they're not. No software company has ever needed legal cover for that and nothing changed in the legal landscape to create that need now. To pretend that there is such a need is to deliberately misrepresent the fundamental nature of what a product, such as software running locally on the user's machine, actually is.
The only justification for having ToS is if Mozilla is transforming Firefox into a service that depends on communication with Mozilla's servers themselves, which is absolutely not just "typing a URL into the URL bar!"