Due to GDK_DECOR_BORDER mShell decoration type the corners have sharp and not rounded corners.
Port of https://hg.mozilla.org/mozilla-central/rev/e7ce94bb130b Differently to FX I had to add a background-image to not make the statusbar transparent. I hope you have a distro which uses rounded corners on the titlebar. To test this you can set mozilla.widget.use-argb-visuals to true and then restart TB.
Assignee: nobody → richard.marti
Status: NEW → ASSIGNED
Attachment #9007387 - Flags: review?(geoff)
Unfortunately on my system (Ubuntu 16.04) there's still a problem with the window drop-shadow not being drawn inside the rectangle, but the corner is actually transparent, and Firefox has the same problem, so I'll still give you your r+.
Attachment #9007387 - Flags: review?(geoff) → review+
Thanks. Maybe you could file a bug in Widget: GTK.
Pushed by email@example.com: https://hg.mozilla.org/comm-central/rev/4eec6def8a10 Port bug 1408360 to TB: Make toplevel window transparent when mozilla.widget.titlebar-theme-round-corners is set. r=darktrojan
Status: ASSIGNED → RESOLVED
Closed: 11 months ago
Resolution: --- → FIXED
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