to this: >>It seems like every company on the web is buying and selling my data. You’re probably no different. Mozilla doesn’t sell data about you (in the way that most people think about “selling data“), and we don’t buy data about you. Since we strive for transparency, and the LEGAL definition of “sale of data“ is extremely broad in some places, we’ve had to step back from making the definitive statements you know and love. We still put a lot of work into making sure that the data that we share with our partners (which we need to do to make Firefox commercially viable) is stripped of any identifying information, or shared only in the aggregate, or is put through our privacy preserving technologies (like OHTTP).
Of course, saying "(in the way that most people think about “selling data“)" makes the guarantee completely meaningless. The rest of the paragraph is just marketing puffery. Its meaningless bromides about how much they value your privacy. Notice they only say they put "lots of work" into stripping identifying information provided to commercial partners (which is just another way of saying selling). Again, this is meaningless. They went from a very strong guarantee to no guarantee at all. Any company that sells your data that makes any effort at all to strip identifying information can make this claim regardless of whether personally identifying information can be recovered with a modicum of effort.