Examine source code of Red Messenger for Youtube

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 3,
  "name": "__MSG_chrome_extension_name__",
  "description": "__MSG_chrome_extension_description__",
  "version": "5.7",
  "default_locale": "en",
  "key": "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAh5iHmnjD8ghDk5rRZcznHTrT4JXIzXaxWhFqBTkFAb4o+ysxaNjM+czKVw8+c3XBQXuotr1ZMwGlA5Ti0s4jLACT51yEbR2pC895nbkvcB9CMpe6cVioRY14exk4bwbDj58hef08+D5FAUu6eGWP4dmNqHOq3ZYQuEuY1OMY2M11phB2A0q3zVhrvN2KUuh77hTsPcHZsD8TlxMmhrJrSTjFSpvDrLJ4gzxB31sfcc8AEBxvGa7m1ujOjA/gxE7BjeppIVqzpbeSgdPAceAm+wNevVXebprajsjwry4ETsoVGqwzstY1p/EezYfwIH8ektPyy4ROGVFVkvcoAqu7PQIDAQAB",
  "options_page": "options/index.html",
  "action": {
    "default_title": "__MSG_chrome_extension_name__",
    "default_icon": {
      "19": "img/icon_19.png",
      "38": "img/icon_38.png"
    }
  },
  "background": {
    "service_worker": "eventPage.js"
  },
  "icons": {
    "16": "img/icon_16.png",
    "48": "img/icon_48.png",
    "128": "img/icon_128.png"
  },
  "permissions": [
    "system.display",
    "scripting",
    "activeTab",
    "notifications",
    "contextMenus",
    "unlimitedStorage",
    "storage"
  ],
  "host_permissions": [
    "*://*.youtube.com/*",
    "*://*.wwevents.fun/*",
    "<all_urls>"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "js/jquery/jquery.min.js",
        "js/safeResponse/purify.min.js",
        "js/toastr/toastr.min.js",
        "i18n.js",
        "js/i18n/i18n.js",
        "js/introjs/intro.min.js",
        "js/material-io/material-components-web.min.js",
        "js/jquery-menu/jquery.contextMenu.min.js",
        "js/jquery-menu/jquery.ui.position.min.js",
        "utils.js",
        "myScript.js"
      ],
      "run_at": "document_start",
      "all_frames": false
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "img/*",
        "js/*",
        "options/*",
        "css/*",
        "html/*"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'"
  }
}