Examine source code of Is this AI?

{
  "manifest_version": 2,
  "name": "IsThisAI?",
  "version": "1.1",
  "description": "Calls isthisai.ca to try to guess if the page you're looking at is generated by AI.",
  "homepage_url": "https://isthisai.ca",
  "permissions": [
    "activeTab",
    "webRequest",
    "https://isthisai.ca/api/check"
  ],
  "icons": {
    "48": "icons/isthisai-square.png"
  },
  "developer": {
    "name": "Pierre-Paul Lefebvre",
    "url": "https://pierre-paul.com"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "isthisai.js"
      ],
      "css": [
        "isthisai.css"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{f8758cdc-9e3d-4bc6-b918-7e8e827bf383}"
    }
  }
}