Examine source code of AudioSpeedToggle

{
  "manifest_version": 3,
  "name": "AudioSpeedToggle",
  "version": "1.0.0",
  "description": "Chuyển tốc độ phát audio qua 3 mức: 1.0x → 1.25x → 1.5x bằng phím tắt. Hữu ích cho podcast, bài giảng.",
  "icons": {
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "permissions": [
    "tabs",
    "activeTab",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icons/icon-48.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content_script.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "commands": {
    "toggle-speed": {
      "suggested_key": {
        "default": "Ctrl+Shift+Y"
      },
      "description": "Toggle audio/video playback speed (1.0 → 1.25 → 1.5)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "@audiospeedtoggle-example",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  },
  "web_accessible_resources": [
    {
      "resources": [
        "icons/*",
        "assets/*"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ]
}