Screenshot of Firefox Privacy settings showing three unchecked checkboxes for collecting various kinds of data.
https://media.hachyderm.io/media_attachments/files/112/452/091/940/310/847/original/70f7730773acf254.png
firefox will now track your searches by default and you'd have no way of knowing they're doing that unless you look for this random blog post on their website: https://blog.mozilla.org/en/products/firefox/firefox-search-update/
it does look like you can turn it off at least.
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