Examine source code of Visioton

{
  "manifest_version": 2,
  "name": "Visioton",
  "version": "0.6",
  "description": "Hide Visio content from Helsingin Sanomat",
  "icons": {
    "48": "icons/visioton-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.hs.fi/*"
      ],
      "js": [
        "visioton.js"
      ],
      "css": [
        "visioton.css"
      ]
    }
  ]
}