title: Nothing happens when I click my chrome extension
body: <p>I am having an issue that when I click my chrome extension, nothing is happening at all.  I would expect there to be an alert box.</p>
  
  <p>Here is my manifest.json:</p>
  
  <pre><code>{
     "background": {
     "scripts": ["background.js"]
     },
     "browser_action": {
        "default_icon": "icon-gif.png",
        "default_title": "AlertBoxer"
     },
     "description": "Use this extension to see an alert box",
     "icons": {
        "128": "icon-gif.png",
        "19": "icon-gif.png",
        "48": "icon-gif.png"
     },
     "name": "C3P0",
     "permissions": ["notifications"],
     "version": "1.0",
     "manifest_version": 2
  }
  </code></pre>
  
  <p>and the background.js file:</p>
  
  <pre><code>chrome.browserAction.onClicked.addListener(function (tab) {
          alert("Hi");  
  });
  </code></pre>