Examine source code of Auto Summary

{
  "manifest_version": 2,
  "name": "Auto Summary",
  "version": "1.0",
  "description": "Tự động tóm tắt nội dung trang web.",
  "icons": {
    "48": "icons/icon.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_title": "Auto Summary",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{2581e19a-e7fb-406f-a8ea-ad4f4035a73c}"
    }
  }
}