Examine source code of Bookmark stats

{
  "description": "Bookmark statistics",
  "manifest_version": 2,
  "name": "Bookmark stats",
  "version": "1.7.1.4",
  "permissions": [
    "bookmarks",
    "<all_urls>",
    "storage"
  ],
  "background": {
    "page": "background-page.html"
  },
  "browser_action": {
    "default_title": "Bookmark stats",
    "default_icon": {
      "16": "icons/line-chart-16.png",
      "32": "icons/line-chart-32.png"
    }
  },
  "icons": {
    "48": "icons/line-chart-48.png"
  }
}