User Agent: Mozilla/5.0 (Windows NT 5.1; rv:6.0) Gecko/20100101 Firefox/6.0 Build ID: 20110811165603 Steps to reproduce: Accepted latest update to Firefox 6.0 on Thursday 18th Aug 2011 and now the side menus in Betfair will not open. This has made Firefox completely useless as this is my main site of use. Actual results: Unable to navigate my favourite web page Expected results: Security update

Please provide a URL of the website and post the steps how to reproduce the problem.

After updating to the latest Firefox, I opened the browser. Without doing anything else, I attempted to click on the side menus "Popular Sports" and "All Sports" but they refuse to open. This has never been a problem before and it all works fine with Microsoft Internet Explorer. Maybe the new update has affected some setting that need sto be changed to allow this site to work correctly OR the update is incompatible with the Betfair website

The site contains an error and have to be fixed. They use an old "javascript command" that isn't supported anymore.