Examine source code of Kahoot Name

{
  "manifest_version": 2,
  "name": "Kahoot Name",
  "version": "1.0",
  "description": "Make a longer name in Kahoot!",
  "content_scripts": [
    {
      "matches": [
        "https://kahoot.it/*"
      ],
      "js": [
        "main.js"
      ]
    }
  ],
  "icons": {
    "48": "icon.png",
    "96": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{51d7e474-cd2f-41cf-bf57-d0c07ab7f675}"
    }
  }
}