Examine source code of Cookie Editor

{
  "manifest_version": 2,
  "name": "Cookie Editor",
  "version": "1.0",
  "description": "Modern cookie editor with popup and full-page views",
  "permissions": [
    "cookies",
    "activeTab",
    "storage",
    "<all_urls>",
    "contextMenus"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Cookie Editor"
  },
  "options_page": "options.html",
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "cookie-editor@example.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}