No, it works perfectly well with firefox.
Redboat, it could be a problem with you local ntl proxy, if you know how to specify anther ntl proxy, do so using port 8080, but try a different region proxy such as swan-cache-4.server.ntli.net.
A full list can be found here,
http://www.cableforum.co.uk/board/article.php?a=10
Hope that helps.