The setting for the "default printer" in Windows really doesn't apply to Firefox. In Firefox the "default printer" is the last printer the user had selected. In the "native print dialog" box, ''(what you see with {Ctrl + P} or File > Print)'' is where you select the Printer you want Firefox to use -- in Printer - Name near the top of that dialog window. That setting should "hold" from print job to print job, even after closing and restarting Firefox. If it doesn't "hold" you will need to select the correct printer the first time each day or every time you want to print from that printer. BTW, I have had a similar problem with a USB connected Inkjet and a Laserjet on my wired network; if the Lasejet "goes to sleep" after the last time I used it, Firefox will "default" to the Inkjet unless I re-select the Laserjet. <br /> I have found no way to fix that "glitch" with any preference that is in Firefox. Also, you might want to check with Lexmark Downloads for updated drivers. IMO, it is rare that the print drivers that came with a printer are the latest available for any model, from any manufacturer. But don't count on it fixing this problem, which I think is with Firefox and "networked" printers.