Firefox has started printing in a different format

My computer shut down for updates overnight. I turned it on this morning. I needed to print out a couple things from Firefox. The printouts all came out in a large format. The print was larger then normal. Only about 2/3 of the page width actually printed out. I experimented to locate the problem. I tried two different printers, both with the same result. I printed out directly from two others programs (Outlook and Word) and the printouts were normal. So it's when i print out from Firefox that the problem occurs. What can I do to return the printing to normal size? == This happened == Every time Firefox opened == this morning,