Examine source code of iDziennik

{
  "manifest_version": 2,
  "name": "iDziennik",
  "version": "2.1resigned1",
  "description": "Dodatek do Firefoxa/Chrome dodający funkcje do iDziennika.",
  "icons": {
    "48": "icons/48.png",
    "96": "icons/96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://iuczniowie.pe.szczecin.pl/mod_panelRodzica/Komunikator.aspx"
      ],
      "js": [
        "komunikator.js"
      ]
    },
    {
      "matches": [
        "https://iuczniowie.pe.szczecin.pl/mod_panelRodzica/Obecnosci.aspx"
      ],
      "js": [
        "obecnosci.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "komunikator.user.js",
    "obecnosci.user.js"
  ],
  "permissions": [
    "tabs",
    "https://iuczniowie.pe.szczecin.pl/mod_panelRodzica/Komunikator.aspx"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{938ed861-ace8-4def-9d02-d8f27e5ddcf9}"
    }
  }
}