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Norton Internet Security upgrade to 5.1.0.29 has changed the fonts in Firefox 4.0.1. I can't permanently change the settings in Firefox.

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Fonts in Firefox 4.0.1 changed after upgrading the Comcast version of Norton Internet Security to 5.1.0.29. I try to save the changes in the Firefox settings, but the fonts don't change. When I restart Firefox in safe mode, the fonts are correct. When I make changes to my website in Dreamweaver, the site does not display correctly on this computer. It does on others. I assume NIS and Firefox 4.0,1 are incompatible. How do I fix this?

Fonts in Firefox 4.0.1 changed after upgrading the Comcast version of Norton Internet Security to 5.1.0.29. I try to save the changes in the Firefox settings, but the fonts don't change. When I restart Firefox in safe mode, the fonts are correct. When I make changes to my website in Dreamweaver, the site does not display correctly on this computer. It does on others. I assume NIS and Firefox 4.0,1 are incompatible. How do I fix this?