That&#x27;s only because <i>you</i> personally don&#x27;t download it.  I can&#x27;t tell you how many times my uncle has installed a new &quot;search toolbar&quot; for Firefox that I&#x27;ve then had to disable.  Luckily, disabling an extension is trivial. For the non-savvy user, though, it&#x27;s still an issue.