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Default font displays incorrectly in Firefox 5.0.1 in OS X Lion.

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Since upgrading to OS X Lion, some fonts in Firefox 5.0.1 display as a font called "Le Monde de Victor" I have installed.

Chosen solution

I had the same problem and the fix was to go to font book. If your not sure where this is search for it. From there have osx validate all your fonts. This should find the fonts that have errors in them. Delete the messed up fonts. In my case I have ~1,700 fonts and 20 had errors. Deleted the ones with errors and this fixed a font issue within Firefox, Outlook and Adobe CS5.

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Websites look wrong

https://support.mozilla.com/en-US/kb/Websites%20look%20wrong

Check and tell if its working.

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None of these suggestions helped. Any other ideas?

You can see an example of what I'm talking about. View this site: http://www.historiclancaster.com/ Then view the image I attached to see what I see.
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You can do a check for corrupted fonts and other font issues:

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Chosen Solution

I had the same problem and the fix was to go to font book. If your not sure where this is search for it. From there have osx validate all your fonts. This should find the fonts that have errors in them. Delete the messed up fonts. In my case I have ~1,700 fonts and 20 had errors. Deleted the ones with errors and this fixed a font issue within Firefox, Outlook and Adobe CS5.

Modified by killgja

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Thanks killgja, I think that did the trick.