hi
On a other forum i found the solution but i have 1 question about it
I try it and it only print to the default printer.
How can i make the change to print to more than 1 printer like he said in the second paragraph. lpr-p some printer

Hello Scott

this problem is because firefox 3.0 uses the gtk-print system,
which uses CUPS by default. You need to tell gtk-print that you
want to use the lprng print-system:

In /etc/gtk-2.0/gtkrc just put:
gtk-print-backends = "lpr,file"

and you can then print to printer i.e. if you want to
print to a specific printer, you need to specify it in
the printmenu in the old unix way "lpr -P someprinter"