Mozilla sends me to Netscapes Plugin finder service, to find a plugin for the content-type 'application/x-lndap' .. I assume it's LDAP related :) Could you provide a download location to the plugin you use ? Also.. if the site requires login, please provide a login username and password.
The problem abt Espn.com , washingtonpost.com..did not exist for me. What build are you using ? I am using 2002071308. Please check it out. I did not check out Lexis.
Invalid, since you don't provide any information to us. I don't believe this problem is Mozillas fault.. More likely the plugin.