Examine source code of Bitcoin Track

{
  "description": "Simple Bitcoin Viewer",
  "manifest_version": 2,
  "name": "BtcView",
  "version": "1.0.9resigned1",
  "icons": {
    "48": "icons/bitcoin-48.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": "icons/bitcoin-32.png",
    "theme_icons": [
      {
        "light": "icons/bitcoin-32-light.png",
        "dark": "icons/bitcoin-32.png",
        "size": 32
      }
    ],
    "default_title": "Bitcoin Viewer",
    "default_popup": "popup/main.html"
  },
  "web_accessible_resources": [],
  "applications": {
    "gecko": {
      "id": "edwin0cheng@gmail.com"
    }
  }
}