Unwanted password autocomplete drop-down appears in Restore Session password dialogs in extension prefs page

[aecreations]

Panic Button 4.3b2+

The password textboxes in the Restore Session password dialogs shows an unwanted autocomplete drop-down.

I've tried adding autocomplete="off" to the <input type="password"> elements, but that has no effect. The MDC docs mention that autocomplete="off" is ignored in certain situations[1].

[1] https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input/password#Using_password_inputs