WebAuthn PRF extension
Derives scoped pseudorandom outputs from a compatible WebAuthn credential.
Support in current browsers
Checked against the current browser versions recorded in MDN browser data 8.0.7.
| Browser | Minimum | Outcome | Reason |
|---|---|---|---|
| Chrome | 150 | Works | Every required mapped BCD feature is available without a recorded qualification. |
| Edge | 150 | Works | Every required mapped BCD feature is available without a recorded qualification. |
| Firefox | 152 | Works | Every required mapped BCD feature is available without a recorded qualification. |
| Safari | 26.5 | Not supported | At least one required mapped feature is not available at this browser baseline. |
| Chrome for Android | 150 | Works | Every required mapped BCD feature is available without a recorded qualification. |
| Firefox for Android | 152 | Not supported | At least one required mapped feature is not available at this browser baseline. |
| Safari on iOS | 26.5 | Not supported | At least one required mapped feature is not available at this browser baseline. |
| Android WebView | 150 | Not supported | At least one required mapped feature is not available at this browser baseline. |
| Samsung Internet | 29.0 | Works | Every required mapped BCD feature is available without a recorded qualification. |
What this feature can and cannot do
Helps protect against
- Exportable application key material
- Password-derived local secrets
Does not guarantee
- Account recovery
- Relying-party verification
- Every authenticator
What you need before using it
- A compatible authenticator
- A reviewed WebAuthn extension design
Fallback to keep in place
Keep key derivation and recovery independent of the extension where it is unavailable.