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Thanks in advance for your help!

about.config is not correct. You need a colon, not period.

about:config

Note that about: is a protocol to access built-in pages.

• http://kb.mozillazine.org/About_protocol_links

Wound up having to refresh my Windows 8 because it wouldn't let me into Microsoft's store. Now, I no longer have Win 8.1 Preview. About:Config seems to be working right now.

Thanks for the help anyway!