Examine source code of Blind Racer

{
  "manifest_version": 2,
  "name": "Blind Racer",
  "version": "1.0",
  "description": "Removes the racing aspect from type racer, so that you can focus on typing",
  "icons": {
    "48": "icons/blind_racer_48.jpg",
    "96": "icons/blind_racer_96.jpg"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.typeracer.com/*"
      ],
      "js": [
        "blind_racer.js"
      ]
    }
  ]
}