Examine source code of Category Bookmark Manager

{
  "manifest_version": 2,
  "name": "Category Bookmark Manager",
  "version": "1.0",
  "description": "Categorize your bookmarks easily.",
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icons/icon128.png"
  },
  "permissions": [
    "bookmarks",
    "storage",
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{89e1dbbe-387a-46ac-9850-4e3cd1f27c10}"
    }
  }
}