Examine source code of Mailbox Stats Viewer

{
  "manifest_version": 2,
  "name": "Mailbox Stats Viewer",
  "version": "1.0",
  "description": "View mailbox stats such as unread emails and total messages directly from the browser.",
  "permissions": [
    "activeTab",
    "storage"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{055098c3-a599-4965-a528-42d23d8939fc}"
    }
  }
}