My HP Deskjet 3050 J610 printer will not print from web sites - it prints ok from WORD, etc. I keep getting the error message: "An unknown error occurred while printing." This problem only arises with Firefox browser. The printer is connected wirelessly to a network and this occurs when I use a laptop on the network. It is also connected via cable to a desktop computer but there is no problem in printing from the desktop. Any assistance would be appreciated.