Improvement suggestion via Reddit:
- Win10 set to dark mode
- Firefox dark theme
White flash when
- opening a new window by moving a tab out of its window.
- closing a window.
- starting Firefox.
It's the same with and without WebRender. However when opened via app menu, new windows fade in softly.
It would be nice if the window could be (at least) black in this case.
Chrome has the same problem when opening a window. But when closing a window, at least its content area is black.