You can do a check for corrupted and duplicate fonts and other font issues: *http://www.thexlab.com/faqs/multipleappsquit.html - Font Book 2.0 Help: Checking for damaged fonts *http://www.creativetechs.com/iq/garbled_fonts_troubleshooting_guide.html ---- Try to repair the disk permissions: *http://thexlab.com/faqs/repairprocess.html Try to remove the Firefox plist file (org.mozilla.firefox.plist). *http://www.macfixit.com/article.php?story=20060606082246983 How .plist files become corrupt and troubleshooting the results Go to "~/Library/Preferences" and remove the plist file for Firefox (org.mozilla.firefox.plist)