title: Call linux command from a html page in Firefox or from Firefox extension
body: <p>Is there any possibily that I can have a html page with button, that when the user click it, it will run linux command on the local machine?</p>
  
  <p>If it is not possible, then is it possible to have a firefox extension that monitor a url, and if the url appear, the extension itself will run a linux command on the local machine?</p>
  
  <p>The html page is run on Firefox on Linux platform.</p>