Firefox Pdf printing woes

When printing to a PDF file in Firefox gives horrible and broken spacing between characters, disable autohinting in your ~/.fonts.conf and restart it :

 <match target="font" >
   <edit mode="assign" name="hintstyle" >
     <const>hintnone</const>
   </edit>
</match>

The problem is known in the Firefox community but it's not solved. This is especially useful if you use mozilla2ps in Xvfb on your server and the problem is noticeable.