Examine source code of GPT Web

{
  "manifest_version": 2,
  "name": "GPT Web",
  "version": "1.0",
  "description": "Use GPT on your current webpage content",
  "permissions": [
    "activeTab",
    "tabs",
    "storage",
    "*://*/*"
  ],
  "browser_action": {
    "default_popup": "index.html"
  },
  "icons": {
    "16": "icons/16.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "index.html"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{f8b0beec-b956-4089-afa5-37573ecc8f80}"
    }
  }
}