Examine source code of Marvin Marburg

{
  "manifest_version": 2,
  "name": "Marvin",
  "version": "1.0",
  "description": "Plays a Marvin dialogue every time you open Marvin",
  "icons": {
    "48": "/icons/Marvin_48.jpg"
  },
  "content_scripts": [
    {
      "matches": [
        "*://marvin.uni-marburg.de/*"
      ],
      "js": [
        "Marvin.js"
      ]
    }
  ]
}