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manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Notepad online",
  "description": "Notepadonline.co is a free online notepad website to create online notes, save notes, text edit, find and replace word,etc.",
  "version": "1.0",
  "action": {},
  "manifest_version": 3,
  "icons": {
    "128": "icon_128.png"
  },
  "background": {
    "service_worker": "background.js"
  }
}