Screen capture from Emtek.com Firefox (italic) vs Safari (correct)

Do you allow pages to use downloadable fonts? Both Emtek and this site use Open Sans as the default font. If Open Sans isn't downloaded, Firefox will try the next font in the font-family rule. In the case of Emtek, it's Helvetica. In the case of this site, it's Arial.

I am attaching a screen shot showing the rules list for part of that Emtek page which is italic for you. If you right-click that area and choose Inspect Element (Q), the Inspector should open with that area active. On the lower right side, click the Font tab to see the actual font Firefox is using. What does yours show?

You can 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