Examine source code of isTest Block

{
  "name": "isTest Block",
  "description": "Blocks isTest2 from tracking your mouse and making you able to cheat.",
  "version": "0.0.1",
  "manifest_version": 2,
  "content_scripts": [
    {
      "matches": [
        "https://istest2.ch/*"
      ],
      "js": [
        "istest.js"
      ]
    }
  ],
  "icons": {
    "48": "icon48.png",
    "128": "icon128.png"
  }
}