title: Stop a Google Chrome Extensions with a On and Off Button. How?
body: <p>I have by default an External JS called alerton that will run on anywebppage when the extension is enabled.
  I've also set up a Popup/Menu for when you click the Chrome Extension Icon at the top right. 
  I want to when the user presses the button "off" to Turn off/Remove an external javascript file called "alerton" </p>
  
  <p>After many many hours, I'm at a loss as to what I need to do to get this to work!
  I've looked at chrome.contentSettings.javascript  However it doesn't seem like I can disable just one particular Javascript file. </p>
  
  <p>I'm hoping someone has an answer...</p>