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Firefox doesn't show headers on websites or mail options such as fonts, etc

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Firefox is the only browser that I'm having these problems with. They are as follows: In the compose e-mail block of my yahoo, it doesn't show the options for fonts, size of fonts, backgrounds, etc. It also won't let me change the color of the fonts. It just shows blank boxes. Not only can't I change things in individual e-mails that I compose, I can't change my e-mail options. In the customize backgrounds and colors for my yahoo page, it doesn't let me change colors or themes. In websites, it doesn't show the headers of the website, including name of website and selections. It's blank. The body of the website shows up. Just not the header. Is there a way restore Firefox to it's original state? If so, how do I do this? Or do I need to uninstall it and reinstall it? I didn't do this when I first started using Firefox.

Firefox is the only browser that I'm having these problems with. They are as follows: In the compose e-mail block of my yahoo, it doesn't show the options for fonts, size of fonts, backgrounds, etc. It also won't let me change the color of the fonts. It just shows blank boxes. Not only can't I change things in individual e-mails that I compose, I can't change my e-mail options. In the customize backgrounds and colors for my yahoo page, it doesn't let me change colors or themes. In websites, it doesn't show the headers of the website, including name of website and selections. It's blank. The body of the website shows up. Just not the header. Is there a way restore Firefox to it's original state? If so, how do I do this? Or do I need to uninstall it and reinstall it? I didn't do this when I first started using Firefox.

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Make sure that you allow pages to choose their colors and that you haven't enabled High Contrast in the Windows Accessibility settings.

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I fixed it myself using the help feature. I restored Firefox to it's original condition. Unfortunately, I lost all my personas, add-ons and toolbars. I'm reluctant to reinstall them so I may go bare for a while.