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See what’s changing in Firefox: Better insights, same privacy
(blog.mozilla.org)
A place to discuss the news and latest developments on the open-source browser Firefox
I don't think this stores how many times you specifically have searched for something - just how many times something has been searched for in general. In other words, nobody will be able to tell anything about you from this data.
(Which is very different from e.g. the data Google collects about you and shares with its partners.)