firefox-safari-style
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White border around window with dark theme
A white border appears around the window using the legacy theme with a dark theme selected in Firefox. The white border also persists in fullscreen videos.
Firefox 89
I also experience this. I used a pixel zooming application and I did not see any white lines near the edges in the light theme, so I am quite sure that the issue is that this is an issue with the dark theme.
Please could you checkit it with Firefox Nightly?
I ask because Firefox does not support real dark mode yet. A dark theme does not change the window itself to system dark mode currently.
But they made progress in recent Nightly.
https://bugzilla.mozilla.org/show_bug.cgi?id=1575070
Only its a bit strange that the white lines is visisble on all borders in your screenshot.