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manifest.json
{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "ETH-MetaMask App",
  "version": "1.0.3",
  "manifest_version": 3,
  "icons": {
    "16": "favicon_16.png",
    "32": "favicon_32.png",
    "64": "favicon_64.png",
    "128": "favicon_128.png"
  },
  "action": {
    "default_icon": "favicon_16.png",
    "default_popup": "../popup/popup.html"
  },
  "background": {
    "service_worker": "background.js",
    "type": "module"
  }
}