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The e-mail folder pane changed appearance after May 5, 2020 upgrade. The folders are black and white only.
The e-mail folder pane icons have changed, they are now totally in black and white with the exception of blue icon folder and title on some of the e-mail names while other names just have a blue icon. This change happened on both my pc and laptop
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Are you using 77beta? See this topic: https://support.mozilla.org/en-US/questions/1286442