Examine source code of Surfboard

{
  "manifest_version": 2,
  "name": "Surfboard",
  "version": "1.0",
  "description": "Surf the web only using your keyboard!",
  "icons": {
    "32": "surfboard.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "myapp.js"
      ]
    }
  ]
}