Sounds like a paper size issue, or excessively large margins.

Try the reset described here:
http://kb.mozillazine.org/Problems_printing_web_pages#Reset_printer

When using FireFox, the pdf's print incorrectly (small) to multiple printers (networked and local). When using IE8, the same pdf's print correctly to those printers. There seems to be more to this than printer settings.

I have tried reset printer as well, but this prints from safari and IE if use a PC. it seems that the margin are too large for the print page and no amount of tinkering with settings or with about:config changes this.

Ok i think i fixed this issues. i went to about:config print.print_margin_bottom (and also left, right and top) and right clicked reset (it took out the previous 0.5 value). now the pages look normal on print preview without the large margin

I have this problem and just downloaded v 10, hoping it would fix it. But to no avail. Printing anything comes out very small. Yet print preview is very large and doesn't fit the page. No problem with IE.

Nothing works!! Adjusting to 100% instead of "shrink to fit" helped with the size of the print, but now some words are cut off at the end of each line, as it doesn't fit the width of the paper. Very frustrating.