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manifest.json
{
  "name": "YtMp3",
  "version": "1.1",
  "manifest_version": 3,
  "description": "YtMp3 allows you to convert your favourite YouTube videos to MP3 or MP4 files, and download them for free.",
  "icons": {
    "16": "icons/16.png",
    "32": "icons/32.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "action": {
    "default_popup": "popup/popup.html"
  },
  "permissions": [
    "activeTab"
  ],
  "update_url": "https://edge.microsoft.com/extensionwebstorebase/v1/crx"
}