title: Why doesn't extension management icon for my Chrome extension show?
body: <p>I am trying to add an icon that displays next to the name of my Chrome extension in the extensions panel. I have tried using the following manifest.json file.</p>
  
  <pre><code>{
    "name": "My Extension",
    "version": "1.0",
    "manifest_version": 2,
    "icons": { "16": "mediumIcon.png", "48": "mediumIcon.png", "128": "mediumIcon.png" },
    "description": "A practice extension.",
    "browser_action": {
      "default_icon": "smallIcon.png",
      "default_popup": "load.html"
    }
  }
  </code></pre>
  
  <p>mediumIcon.png is 128x128. When I enter developer mode in the Extensions tab in Chrome and load my unpacked extension, the icon is not next to the name of my extension. Actually, a black-and-white version of the icon flashes for a split second, after which the default Chrome extension icon (that looks like a puzzle piece) appears.</p>
  
  <p>Why not? I thought that the documentation noted that the icons can scale down if necessary.</p>