[AzzyHN]

Reading just the blog post... these feel like useless metrics. Why do you care what percentage of your users are searching about animals. What do you possibly have to gain from this? Are they planning to introduce animal-based features?

And if it's not for their own metrics, but to sell... who's going to buy? Facebook tracking pixels and other statistics cookies are so much more valuable that this kind of data

[kevincox]

I suspect it is mostly for selling things like default search engine and ads via Firefox Suggest. Some search categories are far more valuable than others for ads.