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How to change background color of New Message screen from white to someting else?

  • 2 replies
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  • 2 views
  • Last reply by Electrojim

Electrojim
Electrojim
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I've got Windows 10 set up for a custom 'blank page' background color through a registry edit; I find a light gray-green much kinder on the eyes. This color came up just fine on a New Message (compose) page in Thunderbird until yesterday, but seems to have been broken by a Windows 10 Update yesterday (7/9/25) to Version 10.0.19045. My custom color still appears behind Microsoft system and app pages (Word & Excel), but no longer is the background for Thunderbird or Firefox, although it does appear behind address bars. Any ideas on why or how to fix would be most welcome.

I've got Windows 10 set up for a custom 'blank page' background color through a registry edit; I find a light gray-green much kinder on the eyes. This color came up just fine on a New Message (compose) page in Thunderbird until yesterday, but seems to have been broken by a Windows 10 Update yesterday (7/9/25) to Version 10.0.19045. My custom color still appears behind Microsoft system and app pages (Word & Excel), but no longer is the background for Thunderbird or Firefox, although it does appear behind address bars. Any ideas on why or how to fix would be most welcome.
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All Replies (2)

david
david
  • Top 10 Contributor
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If you compose in HTML, you can set background at settings>composition

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Electrojim
Electrojim Question owner
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Thanks, David, I did find that option and have coded-in my color scheme. This fixes the problem of a white background when composing outgoing mail, but my Windows 'system' page color selection used to do that, not just on the New Messages screen, but for many incoming messages that were not HTML as well. Something changed with this latest MS update for sure.

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