Examine source code of COROFUN

{
  "manifest_version": 2,
  "name": "COROFUN",
  "version": "666",
  "description": "more fun",
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  }
}