Examine source code of google-ad-cleanser

{
  "name": "google-ad-cleanser",
  "manifest_version": 2,
  "version": "1.0",
  "permissions": [
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.google.com/search?*"
      ],
      "js": [
        "src/cleanse.js"
      ]
    }
  ],
  "icons": {
    "16": "icons/no-ad-16.png",
    "32": "icons/no-ad-32.png",
    "48": "icons/no-ad-48.png",
    "128": "icons/no-ad-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{ad9c7297-3cc2-40b6-ad01-049a17bdc5d8}"
    }
  }
}