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how do i change the colors in firefox

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The background color at the very top of the gui is a dark grey with black text on it. Very hard to see. No squint plus didn't help. What are my next steps?

The background color at the very top of the gui is a dark grey with black text on it. Very hard to see. No squint plus didn't help. What are my next steps?

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Do you have any Themes (Appearance) installed?

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Your Firefox identified itself as Firefox 47 running on Windows Vista. Is that the one with the problem? I'm asking because the issue has been reported by Firefox 48 users on Windows 10 who use a Windows "high contrast" theme, and I have a workaround for that, which is a custom style rule. I haven't tested it on Windows Vista (I don't have access to any Vista systems.)

https://userstyles.org/styles/132146/menu-bar-on-high-contrast-windows-64-bit-firefox

To install a custom style rule, you can use either:

(The problem in Firefox 48 on Windows 10 should be fixed in an upcoming Firefox release.)