Examine source code of Destroy All Cookies

{
  "manifest_version": 2,
  "name": "Cookies Destroy",
  "version": "2.2.0",
  "description": "Quickly wipe cookies, localStorage, and cache",
  "permissions": [
    "cookies",
    "browsingData",
    "tabs",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Cookies Destroy",
    "default_icon": "icons/icon128.png"
  },
  "icons": {
    "48": "icons/icon48.png",
    "64": "icons/icon64.png",
    "96": "icons/icon96.png",
    "128": "icons/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{8977eb27-f545-4b5d-93c1-3b94149f4690}",
      "strict_min_version": "110.0",
      "data_collection_permissions": {
        "required": [
          "websiteContent",
          "websiteActivity"
        ]
      }
    }
  }
}