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to normal. How do I do this?

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A window came up wherein you could change your font color and your background color. I thought it might be fun so I changed both. I am now having problems with some items on Firefox and want to change it back to your original colors. How do I do this?

A window came up wherein you could change your font color and your background color. I thought it might be fun so I changed both. I am now having problems with some items on Firefox and want to change it back to your original colors. How do I do this?

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Open up Options > Content -> Fonts & Colors - Advanced and reset to the default values as shown in the uploaded screenshot below.