TrackMeNot is a lightweight Mozilla Firefox browser extension that protects web searchers against surveillance and data profiling. It does so not by means of concealment or encryption (i.e. covering one's tracks), but instead, paradoxically, by the opposite strategy: noise and obfuscation.
...TrackMeNot runs in Firefox as a low-priority background process that periodically issues randomized search-queries to popular search engines, e.g., AOL, Yahoo!, Google, and MSN. It hides users' actual search trails in a cloud of 'ghost' queries, significantly increasing the difficulty of aggregating such data into accurate or identifying user profiles. TrackMeNot integrates into the Firefox 'Tools' menu and includes a variety of user-configurable options. TrackMeNot
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