Toolbars accessibility, need to customise

Hi. I cannot find a way to change the background colour on toolbars at the top of Thunderbird mail. My eyesight is not good and I find it very hard to read the text. Toolbars can be customised by adding buttons etc, but not in any other way. This is not right, surely, as it excludes people with visual problems, including the elderly.
I cannot find a theme that works, or that would make the right kind of changes. We need to choose background colour, font size, colour and characteristics.

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