Examine source code of SolaApp+

{
  "manifest_version": 2,
  "name": "SolaApp+",
  "version": "0.2.3",
  "description": "Zusätzliche Funktionen für die SolaApp",
  "content_scripts": [
    {
      "js": [
        "solaappplus.js"
      ],
      "css": [
        "style.css"
      ],
      "matches": [
        "https://sola.gymgmunden.at/*"
      ]
    }
  ],
  "icons": {
    "128": "icon_dark.png"
  },
  "permissions": [
    "./chosenTimeperiod.js",
    "./chooseLessons.js",
    "./weeklyPlan.js"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{43672212-3814-4389-bfd2-e494cdad2d74}"
    }
  }
}