Welcome.
This page is the referrer page of the FireWebSSO Firefox addon.
It means that some one connected directly to a page of your web server in using the Single Sign-On mecanisms implemented by FireWebSSO and the remote bookmarks storage.
For more information about the services provided by FireWebSSO, take a look at the features pages.
You can help the "capture" of the authentication form by creating and supplying a site template of your site.

Image: the sites configuration panel.
Note: The URLs used by the FireWebSSO's users are not known by the FireWebSSO server as the URLs are crypted using
the private key of the user. The FireWebSSO server as no way to know the URLs acceded by the users of the addon.
(FireWebSSO FAQ)