I’m not inherently against anonymised and aggregated data collection by services and organisations I support. I understand that it is difficult to compete in the tech industry without this, and in the case of Firefox I believe it is very important that they continue to survive as a mainstream alternative to Google’s market monopoly (even if things are trending in the wrong direction). I also understand that opt-out makes a lot more sense than opt-in for this kind of tracking, since opt-in would significantly reduce and skew the amount of data they had access to and limit its ability to improve the product. However, I think their explanation here is a poor one:

Having an understanding of what types of searches happen most frequently will give us a better understanding of what’s important to our users, without giving us additional insight into individual browsing preferences. This helps us take a step forward in providing a browsing experience that is more tailored to your needs, without us stepping away from the principles that make us who we are.

Again, I understand that it’s not always possible to provide an explanation that is as transparent and detailed as some users may want, but you need to do better than this. I am struggling to see how my browsing experience can be improved through this type of data collection. I don’t want or need a browser that is “tailored to my needs”, and that type of language sounds privacy-invasive to me. If you genuinely believe that what you have planned is going to improve my experience then you need to do a better job of explaining that before you ask me to provide more data.