Examine source code of Smart Tab Manager

{
  "manifest_version": 2,
  "name": "Smart Tab Manager",
  "version": "1.0",
  "description": "Automatically group open tabs by content type to keep your browser organized.",
  "permissions": [
    "tabs"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{0ce53d8b-1493-4a48-a07a-380452ac7f2a}"
    }
  }
}