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0e1f616
(Get the code!)
Created attachment 9121264
Default and Light theme corners, GNOME Shell window screenshots, scale 2, on striped background
This almost works for me, and the behavior is the same whether basic layers or WR is used.
As I understand, the way CSD works here is that the window uses a GTK window style which only draws the shadow around an inner widget drawn by Firefox. Adwaita gives us a soft shadow and a 1px semitransparent outline.
The Default theme has a slight glitch where the corners are not as transparent as they should be. I think the tab bar's "headerbar" styling is trying to draw a window shadow here which gets overlaid with the shadow drawn by the window. We need to either somehow remove the shadow from the headerbar style applied to the tab bar, or somehow mask out the drawing of the window shadow so that it only draws outside the inner widget.
The Light and Dark themes have no "headerbar" styling, so the tab bar has sharp corners which clash with the rounded outline from the window's Adwaita theme.