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I have an HP Colour Laserjet 4650hdn (not sure if that matters) hooked up to my PC. It can print double sided, and I would prefer for it to print double sided. Every-time I print something from Firefox, I must tell it to print double sided. I want it to just print double sided for everything, as a default, to save paper.

I am using Ubuntu 15.10, Mate edition.

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Open your browser, and navigate to http://localhost:631/ which is the CUPS interface

Choose

Administration -> Manage printers -> (your printer name) -> administration -> set default options

At this point you can set the duplex to be default, for either long or short sided duplex.

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    This doesn't affect Firefox's defaults.
    – Sparhawk
    Nov 20, 2016 at 21:28
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For some reason Firefox (50.0) does not respect the system defaults. To make duplex printing the default, navigate to about:config, then search for duplex. Change print.print_duplex to 1, for long-edge binding.

I can't find any documentation of these options on the internet. However, from testing, 0 means single-sided, 2 means short-edge binding. I also had print_duplex set to 2, if that's important.

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