Examine source code of Quick Bookmark

{
  "manifest_version": 2,
  "name": "Quick Bookmark",
  "version": "1.0",
  "description": "Quickly bookmark the current page with one click.",
  "permissions": [
    "bookmarks",
    "activeTab"
  ],
  "browser_action": {
    "default_icon": "icons/bookmark-48.png",
    "default_popup": "popup.html",
    "default_title": "Quick Bookmark"
  },
  "icons": {
    "48": "icons/bookmark-48.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{140c474a-1f3c-421c-9e6b-be8f7d369f57}"
    }
  }
}