They are encrypted - for obvious reasons.

Note: not all browser text fields store the text typed in them.
My internet bank disables this in your browser somehow to stop people having their online logins and passwords misused accidentally (or deliberately).


You may find something similar applies here, otherwise try typing a single letter that the person may have used for his login and hope the list of matches is displayed.
By picking on the list of likely candiates he may be able to login in this way.