Examine source code of Audio Pitch Change

{
  "manifest_version": 2,
  "name": "Audio Pitch Shift",
  "version": "1.0",
  "description": "Thêm nút điều chỉnh tông giọng cho bất kỳ audio/video bằng WebAudio API.",
  "permissions": [
    "tabs",
    "<all_urls>"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c84f7e21-5b93-4d68-a2f7-91e36c0b74ad}",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  }
}