Examine source code of Custom school portal

{
  "manifest_version": 2,
  "name": "School Srortal | Av1dy's System",
  "version": "1.2.2",
  "description": "Изменятор школьного портала. BTW CHECK OUT MY WeBsItE avidy.rf.gd !!!11!!1!",
  "icons": {
    "48": "img/ico_png.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.mosreg.ru/*"
      ],
      "js": [
        "jquery.min.js",
        "main.js"
      ],
      "css": [
        "main.css",
        "dark-mode.css"
      ]
    }
  ],
  "permissions": [
    "*://*.mosreg.ru/*",
    "tabs",
    "storage",
    "webRequest",
    "<all_urls>",
    "scripting"
  ],
  "browser_action": {
    "default_icon": {
      "19": "img/ico_png.png"
    },
    "default_title": "Custom School Amogus",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d0764489-9545-4b84-b8a1-0f8854788f3c}"
    }
  }
}