Well I'm glad you liked the post and taught you something... Finally I wrote something useful! ~~laugh~~

Anyway regarding the code blocks I find that really strange, since I'm also using Firefox (1.5.0.4) and OS X (10.4.7) and the code looks excellent. Maybe it's the font you are using... Don't really know, since I'm not that UI guy... But sounds like a CSS problem.

My default font is Times size 16. If you haven't that please retry...Also if it's not, it's better to report such behaviour to the snipsnap developers:

* Matthias L. Jugel (matthias.jugel -at- first.fraunhofer.de)
* Stephan J. Schmidt (stephan.schmidt -at- first.fraunhofer.de)

Send them a screenshot along with your font information. And it would rock if you spotted the problem in the CSS.