Created attachment 1344265 [details] comparison between native half-maxed windows and Firefox 57 CSD Number of little issues/"paper cuts" to address. - Maximize/split screen keeps the corner rounding. When two windows are half-maximized and share an edge, the corner is not rounded (screenshot attached). - Close button icon is #000. gtk+ tones these down (the mix ends up being #2e3436 (@theme_fg_color). - Close button active state (possibly other window control buttons) shift the icon right and down by a pixel. No such shift happens in native gtk+. - And finally a big one. No :backdrop state. gtk3 application use the state to better differentiate focused and unfocused windows. An unfocused window is generally flatter, with active controls toned down. Adwaita exposes a bunch of @theme_unfocused* colors to deal with the :backdrop state. https://git.gnome.org/browse/gtk+/plain/gtk/theme/Adwaita/_colors-public.scss
In addition to the colors outline above, the close button is smaller and aligned to the top, rather than centered on the vertical estate. The most recent Google Chrome builds (v63) sport a close button that respect both size and color (including the backdrop state).
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