Examine source code of Show hatenabookmark count

{
  "manifest_version": 2,
  "name": "Show hatenabookmark count",
  "version": "1.1.3resigned1",
  "description": "Show hatenabookmark count on current tab.",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "48": "icons/hatenabookmark-logomark-48.png",
      "96": "icons/hatenabookmark-logomark-96.png"
    },
    "default_title": "Open hatebu page"
  },
  "permissions": [
    "http://b.hatena.ne.jp/",
    "tabs"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{5c7f23e8-e097-4e18-8820-d793192f1707}"
    }
  }
}