"But I don't want to use a browser from a company which gives themselves a broad license to do whatever they want with whatever data I enter into the browser"
As this discussion made abundantly clear, that's not what it says at all.
Nothing I have seen makes that clear at all. In fact, from what I can see, the ToS makes it very clear that they are giving themselves a license in the way I describe:
> 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.
Mozilla is clearly planning to do something which requires them to have given themselves this license, and I'd rather not be on Firefox when we figure out what that is.
As this discussion made abundantly clear, that's not what it says at all.