I use Mozilla or it's lighter weight cousin Phoenix to do most of my browsing except for the odd site which requires IE because they've used some M$ software to create the site. (The corporate intranet where I work is a big offender in this regard.) This web site described some ways to do some ad-blocking with css coding in the userContent.css. I used this file to solve a printing problem: At great expense (heh! heh!) I downloaded a driver from HP to do multiple pages/page and correct gray-scale shading at 600dpi with coloured documents on the Laserjet 5 Si/MX at work. One problem, though, is that trying to print pages from some sites will give very light lettering on a white background. Here's a userContent.css entry that will fix this:

@media print { 
  body { background: white ! important;
         color: black ! important; } }

That is, when printing, the default background is white and the text colour is black, unless specifically overridden by the document. Works for me!