I'm thising this is not a firefox bug but a gtk bug to be honest Please install firefox-3.5-gnome-support and if using firefox-3.0 install firefox-3.0-gnome-support and let us know if this is gone.
I'm thising this is not a firefox bug but a gtk bug to be honest 3.5-gnome- support and if using firefox-3.0 install firefox- 3.0-gnome- support and let us know if this is gone.
Please install firefox-