Fluxbox grouping of Firefox3

[Gorgamel]

When upgrading to new Ubuntu, I noticed that Firefox did not group up (use tabs) anymore when opening more windows.
It used to be to write 'gecko' in the group file, but I have tried firefox, Firefox, firefox-3.0, but nothing works.

Anyone have any idea what to do/write to make this work again ??

[pyronaut]

in a terminal type this
xprop |awk '/WM_CLASS/{print $4}'
then u'll see a pointer that u click on the title bar of firefox and it should give you the name to put in your groups file

[kerry_s]

firefox-bin