Printing without the print dialogue using Mozilla Firefox

Instructions

Open Firefox and type ‘about:config‘ in the address bar and press enter.  Click to confirm that you will be careful.

Right click on the page, hover over ‘New’ and click on ‘Boolean’.

Type ‘print.always_print_silent‘ as the preference name and click ‘OK’.

Click on ‘true’ and click ‘OK’.

That’s it, the print dialog boxes will no longer pop up for you!