The tiscali mailbox will not load within firefox 4. I am able to log into the mailbox but once logged in I cannot access the inbox or any other function apart from email composition. Attaching a file to an email also produces a 500 error within the upload window. I have contacted Tiscali/TalkTalk support and they have directed me to you as they claim it to be a browser issue. I have no problems with this website in IE or in Firefox 3. I have not been able to solve the problem by disabling all addons.