Examine source code of GMB Category Viewer

{
  "manifest_version": 2,
  "name": "GMB Category Viewer",
  "version": "1.0",
  "description": "Displays Google My Business categories directly on Google Maps.",
  "icons": {
    "48": "icon.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png",
    "default_title": "GMB Category Viewer"
  },
  "permissions": [
    "activeTab",
    "https://www.google.com/maps/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://www.google.com/maps/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{56622bb6-3e40-4b41-aeb9-666b4b30cd50}"
    }
  }
}