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Theme keeps resetting to dark (win10)

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The theme keeps resetting randomly to "dark" - although it shows that the "light" theme is enabled - it still switches to "dark", i.e. the interface is the dark mode. I then have to Disable and Enable the Light Mode for it to be Light mode again. But, then even within a few minutes, while I might be doing something else - when I go to Thunderbird, it has switched to Dark mode again .... This is FRUSTRATING.

The theme keeps resetting randomly to "dark" - although it shows that the "light" theme is enabled - it still switches to "dark", i.e. the interface is the dark mode. I then have to Disable and Enable the Light Mode for it to be Light mode again. But, then even within a few minutes, while I might be doing something else - when I go to Thunderbird, it has switched to Dark mode again .... This is FRUSTRATING.

Modified by Wayne Mery

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Does https://bugzilla.mozilla.org/show_bug.cgi?id=1857564 match your issue?

Bug 1857564 - In Windows Dark Mode, System Theme enabled, Color option set to "Only with High Contrast Themes" all open message windows revert to Light (non Dark) Mode.

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Hello, No. I do not have Windows Dark mode or "high contrast" anything, or "System Theme" enabled in TB.

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