Great, but a web browser still does not need terms of service. There’s no ongoing relationship between the user and the creator of the browser, at least, there shouldn’t be unless the user signs up for additional optional services.

It’s great if Mozilla wants to offer some optional services users can opt in to, and those services probably need terms. I use Firefox Sync, though I’ve started to reconsider that given the recent fuss. The browser itself? I’ll move to a fork first, and stop recommending Firefox to others.