Examine source code of Text o Speech Reader

{
  "manifest_version": 2,
  "name": "Text to Speech Reader",
  "version": "1.0",
  "description": "Đọc to nội dung văn bản trên trang web bằng giọng nói.",
  "permissions": [
    "activeTab",
    "tabs"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Text to Speech Reader"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f7f093c5-4cf8-4440-888a-5f9aa6943f8f}"
    }
  }
}