Examine source code of Google PageRank Checker

{
  "manifest_version": 2,
  "name": "Google PageRank Checker",
  "version": "1.1",
  "description": "Check the simulated Google PageRank of the current website.",
  "permissions": [
    "activeTab",
    "tabs",
    "https://*/",
    "http://*/"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "32": "icons/logo_32.png",
      "64": "icons/logo_64.png",
      "128": "icons/logo_128.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "32": "icons/logo_32.png",
    "64": "icons/logo_64.png",
    "128": "icons/logo_128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{2da15cf5-1e3e-4444-9912-9cbf564521da}"
    }
  }
}