The trust was lost because of the public's misunderstanding of the change. It was updated as a response to the overly broad legal definitions of "data sales" under laws like the CCPA. As your own link says, Mozilla explicitly stated:
> It does NOT give us ownership of your data or a right to use it for anything other than what is described in the Privacy Notice.
Mozilla lost trust rewriting their policy, and even more trust when they blamed their users for being "confused"[0] IMO. They're the ones with the lawyers and the sponsorships. All blame for "confusion" rests upon the party with the legal upper hand.
Do you know what the "overly broad definition" of "sell data" they cited was? It was "to exchange personal information for money or other things of value".
That's not overly broad. That's what selling is. That's what they told us they were doing. So they told us they were selling our data.
> It does NOT give us ownership of your data or a right to use it for anything other than what is described in the Privacy Notice.