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How do I make the default Page Setup as A4?

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I want Page printing to be in A4 format by default, whereas it is printing in Letter format by default. How do I change this default?

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I want Page printing to be in A4 format by default, whereas it is printing in Letter format by default. How do I change this default? == This happened == Every time Firefox opened

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To reply to this older post: It's as easy as going to File > Page Setup and in "Format for" select "Any Printer" (or a specific printer), and in "Paper size" you obviously select A4. This should be a permanent setting, but you can still change print settings ad hoc.

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wuergler - I don't what operating system you have, but on Windows in Firefox there are no preferences for Paper Size in Page Setup. That setting needs to be changed thru the Properties button after doing File > Print.