Window corner rounding

[Huvitutti]

I'm not sure if this achieveable, but it would be a neat customization option to be able to force window corner rounding to a zone.

Firefox has rounding on top corners by default, but not bottom and it makes stacked browser windows on a vertical monitor look funny.

[gerritdevriese]

I believe only KWin desktop effects can achieve that. Personally I have been using https://github.com/matinlotfali/KDE-Rounded-Corners for a while without any issues, so I can recommend that one.