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manifest.json
{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Create and Read QR Code",
  "description": "All QR codes one click away.",
  "version": "1.0",
  "manifest_version": 3,
  "action": {
    "default_popup": "popup.html"
  },
  "icons": {
    "128": "/assets/icons/icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content-script.js"
      ]
    }
  ]
}