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manifest.json

{
  "manifest_version": 3,
  "name": "WTM YT Thumbnail Grabber",
  "version": "1.0",
  "description": "A simple and easy-to-use to get YouTube video thumbnail extension.",
  "action": {
    "default_popup": "popup.html"
  },
  "icons": {
    "16": "assets/images/icon-16.png",
    "32": "assets/images/icon-32.png",
    "48": "assets/images/icon-48.png",
    "128": "assets/images/icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "wtmytthumbnailgrabber_webmateapp@gmail.com"
    }
  },
  "update_url": "https://edge.microsoft.com/extensionwebstorebase/v1/crx"
}