I generally wait before jumping on the outrage-train for this reason, but two things stand out:

- Mozilla explicitly deleting "we don't sell your data" statements across their documentation

- Following up to criticism that the statement is vague, bullshitty and open to interpretation with statements that are even more vague, bullshitty and open to interpretation.

By now, they've had time to notice that something is not right and that they need to make a clear statement, and they haven't taken the opportunity.