Examine source code of SafeSearch Lock

{
  "manifest_version": 3,
  "name": "SafeSearch Lock",
  "version": "1.0.0",
  "description": "Extension for locking safesearch feature on popular search engines, including Google, Bing and DuckDuckGo",
  "homepage_url": "https://github.com/arfshl/safesearch-lock",
  "permissions": [
    "declarativeNetRequest"
  ],
  "host_permissions": [
    "*://www.google.com/*",
    "*://www.bing.com/*",
    "*://edgeservices.bing.com/*",
    "*://search.yahoo.com/*",
    "*://www.qwant.com/*",
    "*://duckduckgo.com/*",
    "*://www.duckduckgo.com/*",
    "*://start.duckduckgo.com/*",
    "*://startpage.com/*",
    "*://pixabay.com/*",
    "*://search.brave.com/*",
    "*://*.yandex.com/*",
    "*://*.yandex.ru/*",
    "*://*.yandex.az/*",
    "*://*.yandex.by/*",
    "*://*.yandex.co.il/*",
    "*://*.yandex.com.am/*",
    "*://*.yandex.com.ge/*",
    "*://*.yandex.com.ru/*",
    "*://*.yandex.com.tr/*",
    "*://*.yandex.de/*",
    "*://*.yandex.ee/*",
    "*://*.yandex.eu/*",
    "*://*.yandex.fi/*",
    "*://*.yandex.fr/*",
    "*://*.yandex.kz/*",
    "*://*.yandex.lt/*",
    "*://*.yandex.lv/*",
    "*://*.yandex.md/*",
    "*://*.yandex.net/*",
    "*://*.yandex.org/*",
    "*://*.yandex.pl/*",
    "*://*.yandex.tj/*",
    "*://*.yandex.tm/*",
    "*://*.yandex.uz/*",
    "*://yandex.com/*",
    "*://yandex.ru/*",
    "*://ya.ru/*",
    "*://*.ya.ru/*",
    "*://xn--d1acpjx3f.xn--p1ai/*",
    "*://*.xn--d1acpjx3f.xn--p1ai/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "icons": {
    "16": "icons/16.png",
    "32": "icons/32.png",
    "48": "icons/48.png",
    "96": "icons/96.png",
    "128": "icons/128.png",
    "256": "icons/256.png",
    "512": "icons/512.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "@safesearch-lock",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}