manifest: id

manifest: id — The id member specifies a unique, stable identifier for a PWA. Before id, browsers used start_url to identify installed apps — meaning changing start_url could make the browser treat the app as a new, different installation. The id member decouples identity from the start URL.

{
  "name": "My PWA",
  "id": "/my-app",
  "start_url": "/my-app/home",
  "display": "standalone"
}

If id is omitted, the browser defaults to the processed start_url (fragments are stripped during id processing, but query strings are preserved). An explicit id must be same-origin with the start_url.

Browser & ecosystem support

Browser / Platform	Support	Since	Confidence	Source	Notes
Chrome (Desktop)	✅ yes	96	high	ref	—
Chrome (Android)	✅ yes	96	high	ref	—
Edge (Desktop)	✅ yes	96	high	ref	—
Firefox (Desktop)	❌ no	—	high	ref	Not implemented as of Firefox 128.
Safari (macOS)	❌ no	—	high	ref	Not implemented as of Safari 17.
Safari (iOS)	❌ no	—	high	ref	Not implemented as of Safari 17.
Samsung Internet	✅ yes	17.0	medium	ref	—

Source: spec · MDN · Last verified 2026-07-12 · Confidence: medium

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