@odoben
I don't want Mozilla to "process" my data at all. The browser should be a tool that I use to interact with web sites and services. At no point after I download the broswer does Mozilla need to be involved.
Sync is different, whatever other services they offer, then it makes sense to require an agreement. Then Moz has legitimate cause and consent to process data on my behalf.
But basic browsing? There is no way Mozilla should ever see any of my data, let alone "process" it.