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manifest.json
{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 3,
  "name": "Type Master",
  "version": "1.1",
  "description": "Master Typing on Any Webpage",
  "permissions": [
    "activeTab",
    "contextMenus",
    "scripting"
  ],
  "background": {
    "service_worker": "background.js"
  },
  "commands": {
    "start-typing-practice": {
      "suggested_key": {
        "default": "Ctrl+Shift+Y",
        "mac": "Command+Shift+Y"
      },
      "description": "Start typing practice"
    }
  }
}