+ <p>There is enough information in the user agent that sometimes only a few visitors to a website will be the same.
+ If the user agent is combined with another piece of non-unique identifying information, often it results in a unique fingerprint.
+ The Electronic Frontier Foundation created a tool called <a href="https://coveryourtracks.eff.org/">Cover Your Tracks</a> to demonstrate how much information can be gleaned from these sources.
+ If this test is run with JavaScript enabled the amount of information that is disclosed increases greatly.
+ <a href="https://www.browserleaks.com">Browser Leaks</a> and <a href="https://amiunique.org/">Am I Unique</a> are also good sources of information on this topic.</p>