How to change default page size in Firefox to A4

[Andrea <mariofutire googlemail com>]

Hi,

I would like to set the default page size in firefox to A4,
but there seems to be no way of doing it.

Each time the page size is reset to US Letter.

CUPS has a default page size of A4 and all other application (okular, evince...) honour it.

Forgot to say, I'm on Fedora 11, Firefox 3.5.1

Andrea