Examine source code of Google Search Time Filter

{
  "manifest_version": 2,
  "name": "__MSG_extName__",
  "version": "1.0.0",
  "description": "__MSG_extDescription__",
  "default_locale": "en",
  "browser_specific_settings": {
    "gecko": {
      "id": "google-search-time-filter@example.com",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [],
  "content_scripts": [
    {
      "matches": [
        "https://www.google.com/search*",
        "https://www.google.co.jp/search*",
        "https://www.google.co.uk/search*",
        "https://www.google.de/search*",
        "https://www.google.fr/search*",
        "https://www.google.es/search*",
        "https://www.google.it/search*",
        "https://www.google.ca/search*",
        "https://www.google.com.au/search*",
        "https://www.google.com.br/search*",
        "https://www.google.co.in/search*",
        "https://www.google.ru/search*",
        "https://www.google.co.kr/search*",
        "https://www.google.com.mx/search*",
        "https://www.google.nl/search*",
        "https://www.google.pl/search*",
        "https://www.google.se/search*",
        "https://www.google.ch/search*",
        "https://www.google.at/search*",
        "https://www.google.be/search*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "styles.css"
      ],
      "run_at": "document_end"
    }
  ],
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  }
}