Examine source code of Smartschool PRO

{
  "manifest_version": 2,
  "short_name": "SSPRO",
  "name": "Smartschool PRO",
  "version": "1.1.3",
  "icons": {
    "48": "icons/SSPRO.png"
  },
  "description": "Adds quality of life improvements to Smartschool.",
  "content_scripts": [
    {
      "matches": [
        "*://*.smartschool.be/*"
      ],
      "js": [
        "scripts/SSPRO.js"
      ],
      "run_at": "document_start"
    },
    {
      "matches": [
        "*://*.smartschool.be/results/*"
      ],
      "js": [
        "scripts/SSPRO_RESULTS.js"
      ],
      "run_at": "document_end"
    }
  ],
  "web_accessible_resources": [
    "icons/*.png",
    "html_pages/SSPRO_settings.html",
    "html_pages/SSPRO_settings.css",
    "scripts/SSPRO_SETTINGS.js"
  ],
  "permissions": [
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{452ca20b-f174-4b25-8515-026951b34830}"
    }
  }
}