Examine source code of U-Tomorrow

{
  "name": "U-Tomorrow",
  "version": "0.1",
  "description": "Overrides certain style elements of U-Today to create a readable site",
  "manifest_version": 2,
  "icons": {
    "16": "icon.png",
    "32": "icon.png",
    "48": "icon.png",
    "128": "icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.utoday.nl/*"
      ],
      "css": [
        "override.css"
      ],
      "run_at": "document_start"
    }
  ],
  "permissions": [
    "*://www.utoday.nl/*"
  ]
}