title: chrome extension : how to display an icon in the toolbar?
body: <p>I've created a simple extension but the icon is not being displayed in the browser's toolbar and in fact I see many other extensions installed but not their icon in the toolbar. What element in the manifest file defines that an icon should display an icon in the toolbar?</p>
  
  <p>Here is the used manifest file and this manifest does not add any icon to the toolbar</p>
  
  <pre><code>{
    // Extension ID: my_id
    "key": ".....my key.......",
    "name": "....any name....",
    "version": "1.0",
    "manifest_version": 2,
    "description": "description",
    "app": {
      "launch": {
        "local_path": "main.html"
      }
    },
    "icons": {
      "128": "icon-128.png"
    },
    "permissions": [
      "...."
    ]
  }
  </code></pre>