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Unable to completely remove a dark theme

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I added a black/dark theme. Went back to default but the black background remains. The upper/top menu is the default colors but everything below remains black. All background is black and typing s white. It has even taken over other programs such as Yahoo mail. It's all black, can barely read anything. I've removed all themes but the default. I've re-started but it's still black. Anyone have any suggestions?

I'm using FF 48.0.2 Windows 10

I added a black/dark theme. Went back to default but the black background remains. The upper/top menu is the default colors but everything below remains black. All background is black and typing s white. It has even taken over other programs such as Yahoo mail. It's all black, can barely read anything. I've removed all themes but the default. I've re-started but it's still black. Anyone have any suggestions? I'm using FF 48.0.2 Windows 10

Chosen solution

Figured out the problem. Looked in the add-ons and found something I did not add. An add-on that changed background to black and text to white. FYI if anyone else having this problem. Figured this out by going into "Tool> options> content> fonts & colors> colors" In here it told me something was overriding my color scheme.

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Chosen Solution

Figured out the problem. Looked in the add-ons and found something I did not add. An add-on that changed background to black and text to white. FYI if anyone else having this problem. Figured this out by going into "Tool> options> content> fonts & colors> colors" In here it told me something was overriding my color scheme.