Examine source code of FreiwilligJaAddOn

{
  "manifest_version": 2,
  "name": "FreiwilligJaAddOn",
  "version": "1.2",
  "description": "Better FreiwilligJa",
  "icons": {
    "48": "icons/Ja.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://freiwillig-ja.de/*"
      ],
      "js": [
        "modify.js"
      ],
      "css": [
        "style.css"
      ]
    },
    {
      "matches": [
        "https://freiwillig-ja.de/anbieter/meine-stellen*"
      ],
      "js": [
        "addFunctions.js"
      ],
      "css": [
        "style.css"
      ]
    }
  ],
  "web_accessible_resources": [],
  "browser_specific_settings": {
    "gecko": {
      "id": "{aa54aa3d-9338-41f8-85ad-164437b97ac4}"
    }
  }
}