Firefox, the Mozilla Suite and Thunderbird are all set to have updates published soon to correct coding errors in the current generation
http://chkpt.zdnet.com/chkpt/ukzdfeed/http://news.zdnet.co.uk/software/applications/0,39020384,39209576,00.htm
http://chkpt.zdnet.com/chkpt/ukzdfeed/http://news.zdnet.co.uk/software/applications/0,39020384,39209576,00.htm