The ToU is clearly referring to the browser, not the other products of the Firefox brand family. The literal first two paragraphs:
> 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.
> 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.