When entering file credentials in the ‘Default File Options’ dialogue I believe it would be better to have autocomplete disabled. The screenshot below shows that typing “admin” is automatically replaced (on my Mac) with “Admin”. I can’t think of an instance where I would want autocomplete when entering an account name and it is annoying when what I type is changed. This behaviour can be changed by adding the autocomplete off attribute to the input tags.
<input autocomplete="off" />