Examine source code of Mein VIS

{
  "manifest_version": 2,
  "version": "1.13",
  "name": "Mein VIS",
  "description": "Diverse Änderungen an der Mein VIS Seite",
  "author": "Ralf Beckebans",
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://mein-vis.de/",
        "https://mein-vis.de/*"
      ],
      "css": [
        "mein_vis.css"
      ],
      "js": [
        "mein_vis.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "permissions": [
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{625558b8-f7a3-4dcd-9115-7b028240fc6f}"
    }
  }
}