printing in firefox 3.6

Hi
I cant print in firefox 3.6 by cups.
Whe i go to file print i see the printers.
The file is send to the wright printer.
Printer crasch.
I look on internet en found a solution.
Firefox can only print to file.
I had to add
gtk-printer-backbands =“lpr,file”
in /etc/gtk-2.0 in the file gtkr.
and restart cups
When i co to the printers i don’t see the printers but only lpr.
When i klik print the page wil print but only to the defualt printer. Is there a solution the fix this error.
Ore how can i give the commando lpr -p printername. I try this on command line
I make 2 printqueue’s to the same printer and
when i give echo “text” | lpr -p printername it works
How can i change the gtkr file to have the posibility to slect the printers

I have the same problem, external cups server, I can only print to file and then I’m able to print everywhere by the pdf viewer, is there any solution?

I can print with firefox from my two network printers without a problem.
The printers are using lpr.