Resize Useit.com
resizeuseit.user.js - install as Greasemonkey User Script.
Most of the time, Jacob Nielsen's Alertbox articles on useit.com are really worth reading, if only the text were not so, err, usable. In what looks like a "one man's readability guerilla", Nielsen selected a really huge font size. Maybe it is just me, but I find it a really bad experience to read body text like this.
Anyway, this GM userscript modifies the stylesheet rules of useit.com to use more modestly sized text styles. This is especially useful if you want to print an article, apart from the benefit of improved readability (sic!) you will spill more paper than needed on the huge fonts.
About Greasemonkey
Greasemonkey is a Firefox extension, which can change web pages by applying cleverly crafted user scripts after they are loaded in the browser.
Tip! Greasemonkey Hacks by Mark Pilgim.
More Greasemonkey User Scripts
For more, and a couple of Greasemonkey resources, see Greasemonkey User Scripts.

