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!
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