Firefox Uses Incorrect Paper Size When Printing
When printing, Mozilla Firefox uses a paper size that is different to the size specified in the printer driver, eg. it attempts to print at “Letter” size when the printer is configured to “A4”.
This occurs because Firefox stores the printer setting in its configuration file, and subsequently ignores any settings in the printer.
The incorrect size may be stored if you install the US version of Firefox (which uses Imperial sizes) instead of the UK version of Firefox (which uses metric) — or vice-versa.
It may also happen if you print a webpage from Firefox before the printer driver has been configured with the correct paper sizes.
Firefox does not provide a simple GUI function to alter the paper size used by each printer. There are a variety of methods to rectify.
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