title: Chrome Content Script (De)/Activate
body: <p>I am trying to let users activate/deactivate a Chrome content script via a button.
  It seems to me that the best way to do this is via chrome.browserAction.</p>
  
  <p>But if I add</p>
  
  <pre><code> chrome.browserAction.onClicked.addListener(function(tab) {
   chrome.tabs.executeScript(null, {file: "script.js"});
   });
  </code></pre>
  
  <p>to the background.html the script is running no matter if the button is pushed or not.
  The rest of the script is running fine. The only issue is the browser button. 
  Any ideas where the problem might be?
  Thanks!</p>