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FF does not use the default printer settings, like doublesided print. Why not?

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The printing preferences for my printer (Epson XP-630) are set to print on both sides. When I print something with FF, it prints on one side only. So I need to go to printing properties each time to set to print on both sides.

Why does FF not use the default printer settings?

The printing preferences for my printer (Epson XP-630) are set to print on both sides. When I print something with FF, it prints on one side only. So I need to go to printing properties each time to set to print on both sides. Why does FF not use the default printer settings?

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I don't know "why" - it is the way it is. Many preferences for print drivers are only available via Properties for each printer. I addition to 2-sided, there is no setting in Firefox for Color / Greyscale as much more common 'toggle' preference.

Firefox uses "last used" as the default for the few printer preferences that are in Firefox; not the system defaults. I can only guess that the "age" of the printer code (circa 1995 when Netscape wrote the original Gecko printer code) and the cross- operating system compatibility for Firefox is part of the reason.