In Firefox, if the width of your page layout exceeds your margin
width of your page margins, Firefox may automatically squeeze the
size of the output to fit the margins. This will reduce the line
height of the printed output.
Color of manuscript rules may require
experimentation for any given browser/printer combination.
To change your page margins, click File - Page Setup (and in
Firefox, click the Margins & Header/Footer tab), then make your
Both IE6 and Firefox
have a Print Preview mode: click File -
To printing in Landscape mode, click File - Page Setup and choose Landscape.