Want to revert Firefox 18.0.1 theme to [Default 18.0]

Before upgrading from 18.0 to 18.0.1, the Firefox theme listed under [Tools][Add-ons][Appearance] was called "Default 18.0" and was better than the default in 18.0.1. I want to restore the plain old default 18.0 theme, but I could not find it in the humongous collection of available themes. I do not want a fancy theme, just the old default for 18.0.

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