Start Thunderbird
Select Edit -> Preferences.
Scroll right down and click on Config Editor… button
Locate value layout.css.devPixelsPerPx and modify it per convenience.
This is needed for displaying messages in the right text size if using a HiDPI display.
There is no Edit -> Preferences -> General option
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Thanks. Corrected. In the newer version there is no General. Just Edit->Preferences and then the Config Editor.
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