Examine source code of Scrolantana

{
  "manifest_version": 2,
  "name": "Scrolantana",
  "version": "1.0",
  "description": "Control apperance of scrollbars in all webpages",
  "icons": {
    "256": "icons/icon-256.png"
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "css": [
        "scrollbar-style.css"
      ]
    }
  ]
}