Examine source code of Audio Speed Controller

{
  "manifest_version": 2,
  "name": "Audio Speed Controller",
  "version": "1.0",
  "description": "Thêm thanh chỉnh tốc độ phát cho mọi audio nhúng.",
  "permissions": [
    "tabs",
    "activeTab"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{0fb764e8-8c0c-4f7c-9f62-03f2ef93e91e}"
    }
  }
}