Examine source code of Azubiheft Hack

{
  "manifest_version": 2,
  "name": "Azubiheft Hack",
  "version": "1.3.0",
  "version_name": "v1.3",
  "author": "M4rt1n",
  "homepage_url": "https://azubihefthack.roessler.uk",
  "description": "Improvements of azubiheft.de",
  "developer": {
    "name": "M4rt1n",
    "url": "https://azubihefthack.roessler.uk"
  },
  "icons": {
    "48": "icons/azubihefthack.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.azubiheft.de/*"
      ],
      "js": [
        "azubihefthack.js"
      ]
    }
  ],
  "applications": {
    "gecko": {
      "id": "azubihefthack-public@roessler.uk"
    }
  }
}