> Second clause establishes that when you input that data you give firefox a license to that data which you otherwise own
Firefox doesn't need a license, because it's not a legal entity; it's software acting on behalf of a person (the user).
Mozilla doesn't need a license to all information input through Firefox, because Mozilla doesn't need that data for Firefox to operate.
I will maintain it is an issue of clarity. Your argument is that Mozilla isn't offering online services but this isn't true and clarifying what actions upload information and exactly how that information would be used would mollify this. The list would probably be quite extensive. Moreover, the clause doesn't necessarily give them a license to all information input through firefox and that clarification should be demanded of them.
> Firefox is free and open source web browser software, built by a community of thousands from all over the world.
> Please read these Terms of Use (“Terms”) carefully because they explain important information about using your copy of the Firefox software. These Terms are a binding agreement between Mozilla Corporation (“Mozilla”) and You. For details about Firefox privacy practices, please read the Firefox Privacy Notice.