Examine source code of MailGPT

{
  "name": "MailGPT",
  "description": "Display ChatGPT response as a suggestion to complete emails",
  "version": "1.0.2",
  "manifest_version": 2,
  "icons": {
    "16": "logo.png",
    "32": "logo.png",
    "48": "logo.png",
    "128": "logo.png"
  },
  "permissions": [
    "storage",
    "https://mail.google.com/*",
    "https://*.openai.com/"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "css": [
        "content-script.css"
      ],
      "matches": [
        "https://mail.google.com/*"
      ],
      "js": [
        "content-script.js"
      ],
      "run_at": "document_end"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{83f7776e-55ff-4922-a9c0-b11ef65b331c}"
    }
  }
}