http://www.rmsg.co.uk give a warning at the top of the page when visited with Firefox 7.0, "This website is best viewed in Internet Explorer 8 or above. You are currently using an old version of Internet Explorer. Please click on this link to update your browser." The browser sniffing code on this site should be improved.
Created attachment 563244 [details] screenshot Confirmed. Attaching screenshot of site with warning. Mozilla/5.0 (X11; Linux x86_64; rv:7.0) Gecko/20100101 Firefox/7.0