Italic fonts in Firefox Interface [solved]

A coworker had this problem. After installing a plugin-update, the fonts on her Firefox interface were all italic. We combed over the preferences to no avail, then a simple Google search revealed the answer.

1. Open Font Book
2. Find Lucida Grand Regular
3. Right Click > Reveal in Finder
4. Delete it. AAHHHHH!!!! Yes, I'm sure, delete it,
5. Witness the true power of a fully operational Mac Station, it suddenly recreates the font for you. Amazing

Now of course you need to restart Firefox, and everything was cool.

Credit:
http://www.stucel.com/blog/firefox-bold-font-ui-problem-snow-leopard