User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:94.0) Gecko/20100101 Firefox/94.0
Steps to reproduce:
Mac OS X 11.6 on Apple M1 chip.
After upgrade to Thunderbird 91 light theme is not completely light in evenings and night.
- set light theme in thunderbird.
- check that all is ok. Work at the day.
- close note and open it in evening.
- check 'black' Folder Pane and Quick Filter Bar.
Folder Pane and Quick Filter Bar is a black color.
DIsable and enable Light theme fixes it, but it will reproduce in the next evening.
It happens then In Mac OS X 'Appearance' is set to 'Auto' (light theme in day, dark theme in night time).
Light theme should be persistent, if I set it. If I want color changes I'll set System theme.