Bug is reproducible here:
Firefox 3.5.5: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.5) Gecko/20091109 Ubuntu/9.10 (karmic) Kubuntu 9.10 x86: Linux ubuntu 2.6.31-15-generic-pae #50-Ubuntu SMP Tue Nov 10 16:12:10 UTC 2009 i686 GNU/Linux nVidia Drivers 185.18.36
Bug is reproducible here:
Firefox 3.5.5: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.5) Gecko/20091109 Ubuntu/9.10 (karmic) 15-generic- pae #50-Ubuntu SMP Tue Nov 10 16:12:10 UTC 2009 i686 GNU/Linux
Kubuntu 9.10 x86: Linux ubuntu 2.6.31-
nVidia Drivers 185.18.36