Examine source code of Improvements for Vulcan

{
  "manifest_version": 3,
  "description": "Poprawia uciążliwe elementy stron usług eduVULCAN oraz Dziennik Vulcan",
  "version": "0.4.2",
  "name": "Improvements for Vulcan",
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "*://dziennik-uczen.vulcan.net.pl/*",
    "*://dziennik-wiadomosci.vulcan.net.pl/*",
    "*://uczen.eduvulcan.pl/*",
    "*://wiadomosci.eduvulcan.pl/*",
    "*://dziennik-logowanie.vulcan.net.pl/*",
    "*://eduvulcan.pl/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "j.skup.test@gmail.com",
      "strict_min_version": "128.0"
    },
    "gecko_android": {
      "id": "j.skup.test@gmail.com",
      "strict_min_version": "128.0"
    }
  },
  "web_accessible_resources": [
    {
      "resources": [
        "patches/*",
        "patches.json"
      ],
      "matches": [
        "*://dziennik-uczen.vulcan.net.pl/*",
        "*://dziennik-wiadomosci.vulcan.net.pl/*",
        "*://uczen.eduvulcan.pl/*",
        "*://wiadomosci.eduvulcan.pl/*",
        "*://dziennik-logowanie.vulcan.net.pl/*",
        "*://eduvulcan.pl/*"
      ]
    }
  ],
  "content_scripts": [
    {
      "js": [
        "execute.js"
      ],
      "matches": [
        "*://dziennik-uczen.vulcan.net.pl/*",
        "*://dziennik-wiadomosci.vulcan.net.pl/*",
        "*://uczen.eduvulcan.pl/*",
        "*://wiadomosci.eduvulcan.pl/*",
        "*://dziennik-logowanie.vulcan.net.pl/*",
        "*://eduvulcan.pl/*"
      ],
      "world": "MAIN"
    },
    {
      "js": [
        "apply.js"
      ],
      "matches": [
        "*://dziennik-uczen.vulcan.net.pl/*",
        "*://dziennik-wiadomosci.vulcan.net.pl/*",
        "*://uczen.eduvulcan.pl/*",
        "*://wiadomosci.eduvulcan.pl/*",
        "*://dziennik-logowanie.vulcan.net.pl/*",
        "*://eduvulcan.pl/*"
      ]
    }
  ],
  "action": {
    "default_popup": "popup/index.html"
  },
  "icons": {
    "128": "assets/logo/logo-128-red.png",
    "192": "assets/logo/logo-192-red.png",
    "512": "assets/logo/logo-512-red.png"
  }
}