Examine source code of best porn blocker

{
  "manifest_version": 3,
  "name": "STOP-IT V2 Porn Blocker Adult Sites NSFW",
  "description": "STOP-IT V2 blocks porn & adult sites, XXX words, ad servers, tracking, and harmful content.",
  "version": "5.25",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "alarms",
    "storage",
    "tabs",
    "webNavigation",
    "declarativeNetRequest"
  ],
  "host_permissions": [
    "https://stop-it.be/*",
    "*://*.google.com/*",
    "*://*.bing.com/*",
    "*://*.yahoo.com/*",
    "*://*.duckduckgo.com/*",
    "*://*.youtube.com/*",
    "*://youtu.be/*",
    "*://search.brave.com/*",
    "*://*.qwant.com/*",
    "*://*.yandex.com/*",
    "*://*.ecosia.org/*",
    "*://*.baidu.com/*",
    "*://*.reddit.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.google.com/*",
        "*://*.bing.com/*",
        "*://*.qwant.com/*",
        "*://*.yahoo.com/*",
        "*://*.duckduckgo.com/*",
        "*://*.yandex.com/*",
        "*://*.ecosia.org/*",
        "*://*.baidu.com/*",
        "*://*.youtube.com/*",
        "*://youtu.be/*",
        "*://search.brave.com/*",
        "*://*.reddit.com/*"
      ],
      "js": [
        "filter.js"
      ],
      "run_at": "document_start"
    },
    {
      "matches": [
        "*://*.reddit.com/*"
      ],
      "js": [
        "forum-filter.js"
      ],
      "run_at": "document_start"
    }
  ],
  "action": {
    "default_popup": "popup.html",
    "default_title": "STOP-IT V2"
  },
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "contact@stop-it.be",
      "strict_min_version": "140.0"
    }
  }
}