Examine source code of Whose Your Daddy

{
  "name": "__MSG_extensionName__",
  "author": "Terry",
  "version": "0.3.6",
  "description": "__MSG_extensionDescription__",
  "manifest_version": 2,
  "default_locale": "en",
  "icons": {
    "16": "icon_16.png",
    "24": "icon_24.png",
    "48": "icon_48.png",
    "96": "icon_96.png",
    "128": "icon_128.png"
  },
  "permissions": [
    "<all_urls>",
    "tabs",
    "webNavigation",
    "webRequest",
    "webRequestBlocking"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_icon": {
      "16": "toolbar_16.png",
      "20": "toolbar_20.png",
      "24": "toolbar_24.png",
      "38": "toolbar_38.png",
      "48": "toolbar_48.png"
    },
    "default_title": "__MSG_toolbarTitle__"
  }
}