From the same privacy policy you linked:


I don't personally understand the disconnect between the parts we each posted, but there is a clear disconnect regardless.
And, regardless, this applies to fakespot.com. Not Firefox. Not even slightly Firefox. Firefox unambiguously has nothing to do with selling user data.
Edit: I've also gone ahead and sent an email to the address at the bottom of the policy asking for clarification on the issue.
Four weeks later edit: They replied to my email. Here is their response:
Hello,
Thank you for contacting Mozilla and for your question. At this time, Fakespot does not sell or share any user data pursuant to any applicable privacy laws. The only data we share outside of Mozilla are generalized aggregated metrics with service providers who make Faksepot run to help us with logging and debugging issues to provide an uninterrupted experience for our customers, and we do not share this data for monetary gain. We are in the process of updating our privacy policy for additional clarity on all the points referenced in your email.
We trust this answers your questions and thank you again for reaching out.
Kind regards,
Mozilla