Make sure pages are allowed to choose their own fonts.

1. Windows Explorer Installation
2. Tow Hitch 2013 Explorer Installation
3. Internet Explorer Installation

• Tools > Options > Content : Fonts & Colors > Advanced: [X] 'Allow pages to choose their own fonts, instead of my selections above'

Windows Explorer Installation

Tow Hitch 2013 Explorer Installation

• You can check the gfx.downloadable_fonts.enabled pref on the about:config page to make sure that you aren't blocking downloadable fonts.

Try Firefox Safe Mode to see if the problem goes away. Safe Mode is a troubleshooting mode, which disables most add-ons.

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(If you're not using it, switch to the Default theme.)

• On Windows you can open Firefox 4.0+ in Safe Mode by holding the Shift key when you open the Firefox desktop or Start menu shortcut.
• On Mac you can open Firefox 4.0+ in Safe Mode by holding the option key while starting Firefox.
• On Linux you can open Firefox 4.0+ in Safe Mode by quitting Firefox and then going to your Terminal and running: firefox -safe-mode (you may need to specify the Firefox installation path e.g. /usr/lib/firefox)
• Or open the Help menu and click on the Restart with Add-ons Disabled... menu item while Firefox is running.

Once you get the pop-up, just select 'Start in Safe Mode'

If the issue is not present in Firefox Safe Mode, your problem is probably caused by an extension, and you need to figure out which one. Please follow the Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems article for that.

Internet Explorer Installation

To exit the Firefox Safe Mode, just close Firefox and wait a few seconds before opening Firefox for normal use again.