Can't log in to GUI with <enter> when credentials are saved

When logging into the FreeNAS GUI without a saved password (in the browser) everything is fine. But if the credentials are saved, it's automatically filled in by the browser, however hitting &lt;enter&gt; does not log into the GUI.

One has to either click on the Username or Password field (which are automatically populated) or directly click “LOG IN”. If focus were on the user name or password field, one could just hit &lt;enter&gt; to log into the GUI. Many other GUIs work this way and if the session expires one can just hit &lt;enter&gt; to log in again. FreeNAS, however, requires an additional click.

Desired behaviour: Hitting &lt;enter&gt; should be sufficient to log in (when the credentials are saved). Note that this should also work when the session has expired and the “session expired” window is displayed.

Firefox 68.9.0esr