Just wanted to make sure everyone knows the workaround, at least for downloading:
Visit the URL for your settings (.rdf) file in firefox itself. From the File menu, save it to your desktop (or wherever). Open up PasswordMaker (CTRL-`), right click in an empty area (not in the account list area) and select Import Settings. Select the RDF file and hit OK.
You can basically do the reverse for uploading, but I haven't tested how your other PasswordMaker installations (if you have any) might react to that.