From the new terms:
When you upload or input information through Firefox, you hereby grant us a nonexclusive, royalty-free, worldwide license to use that information to help you navigate, experience, and interact with online content as you indicate with your use of Firefox.
Assuming this refers to a new feature, how are they going to implement it? If the browser e.g. phones home, people would be able to spot the change in the source code and just create a fork?
Yes but that only works for geeks, so it is better than nothing but still a sad solution.