Examine source code of Neuramail

{
  "manifest_version": 2,
  "name": "Neuramail",
  "description": "Compose email drafts using Neuramail AI",
  "version": "1.0",
  "permissions": [
    "activeTab",
    "storage",
    "cookies",
    "https://www.neuramail.co/",
    "*://mail.google.com/*",
    "*://outlook.office.com/*",
    "*://outlook.live.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "*://mail.google.com/*",
        "*://outlook.office.com/*",
        "*://outlook.live.com/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "content.css"
      ]
    }
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1bb85762-e6d0-4c2e-a9b4-5e44a9514aef}"
    }
  }
}