Examine source code of Urim

{
  "manifest_version": 2,
  "name": "Urim",
  "description": "Yet another Tag Cloud based on browser content",
  "version": "0.4.1resigned1",
  "permissions": [
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Attach Urim Sidebar",
    "default_icon": {
      "16": "data/images/icon-16.png",
      "32": "data/images/icon-32.png"
    }
  },
  "web_accessible_resources": [
    "data/images/flags/64/*.png",
    "data/css/*.css"
  ],
  "icons": {
    "16": "data/images/icon-16.png",
    "32": "data/images/icon-32.png",
    "48": "data/images/icon-48.png",
    "64": "data/images/icon-64.png",
    "128": "data/images/icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "o.mazko@mail.ru"
    }
  }
}