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Firefox will not print at all to my HP PSC 750 printer and loses all formatting when trying to print to Brother HL-5240 printer

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I have no problem with either of my printers when printing from either Avant 11.7 or IE 6.0.2800.1106 but can not print from Firefox 3.6.8 (or earlier).

When trying to print to the HP PSC 750 inkjet printer, a "Printing" dialog box appears, showing Title: xyz and a progress meter showing 100% but this is being overlaid almost immediately by a second dialog box stating "An unknown error occurred while printing" and, while the printer continues saying "printing", no printing will take place.

When trying to print to the Brother HL-5240 laser printer, printing will occur but all formatting is lost and what comes out is a block of unintelligible running text.

I have no problem with either of my printers when printing from either Avant 11.7 or IE 6.0.2800.1106 but can not print from Firefox 3.6.8 (or earlier). When trying to print to the HP PSC 750 inkjet printer, a "Printing" dialog box appears, showing Title: xyz and a progress meter showing 100% but this is being overlaid almost immediately by a second dialog box stating "An unknown error occurred while printing" and, while the printer continues saying "printing", no printing will take place. When trying to print to the Brother HL-5240 laser printer, printing will occur but all formatting is lost and what comes out is a block of unintelligible running text.