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Thunderbird custom themes

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I'm trying to change the colors on Thunderbird, and I want it to match my Firefox colors. I have customized my colors on Firefox with the Firefox Color website(?) and I'm wondering if there is a way to apply that customization to Thunderbird.

I have tried exporting my custom theme from Firefox Color (both formats) and then manually installing it to Thunderbird, but it tells me the files appear to be corrupted when I try installing.

If anyone knows a way to customize the Thunderbird colors myself, rather than having to rely on pre-built themes, please let me know. I like to change the colors to match my desktop picture, so it changes somewhat often.

I'm trying to change the colors on Thunderbird, and I want it to match my Firefox colors. I have customized my colors on Firefox with the Firefox Color website(?) and I'm wondering if there is a way to apply that customization to Thunderbird. I have tried exporting my custom theme from Firefox Color (both formats) and then manually installing it to Thunderbird, but it tells me the files appear to be corrupted when I try installing. If anyone knows a way to customize the Thunderbird colors myself, rather than having to rely on pre-built themes, please let me know. I like to change the colors to match my desktop picture, so it changes somewhat often.

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TB colours can be modified with userChrome.css. There are many examples on this forum for individual elements, as well as on another forum.