Extension bug report: LastPass passkey prompt remains visible after authentication

Mike Robinson

Reproduction

1. Use a secure origin with a passkey available to LastPass.
2. Open a native HTML <dialog>.
3. Start navigator.credentials.get() and complete the passkey request with LastPass.
4. Immediately after the promise resolves, close and remove the page dialog, then show a username input.

Expected

The “Logging in with passkey...” panel should close after successful authentication.

Actual

The panel remains visible after the page dialog closes and is removed. DevTools showed the prompt iframe inside LastPass's closed shadow root.

Extension source clue

LastPass Firefox 4.141.0, web-client-content-script.js (minified), in the passkey prompt path:

t.passkeyLoggingInPrompt
f = document.querySelector("dialog[open]")
f && { container: f }
data-automation-id="tab-prompt-container"

The prompt portal selects the first open page dialog as its container.

Affected versions observed

• LastPass 4.154.2 in Opera
• LastPass 4.141.0 in Firefox

Suggested fix

Create a LastPass-owned dialog with a unique ID and target it explicitly. Do not select an arbitrary host-page dialog. Close and clean up the owned dialog when passkey authentication succeeds or is cancelled.

Hilda C

Hello @Mike Robinson

Thank you for contacting us in our Community. About the behavior you flagged to us, may I know if you have try any troubleshooting by your own to possible fix it?

I was unable to replicate the behavior, please follow the steps on this article: Basic troubleshooting for LastPass (desktop)

Any updates let us know.