This Extension Enables Rounded Window Corners in Ubuntu 22.04/Fedora36
Gnome finally has an extension to enable rounded corners for all app windows, and customize the window borders!
Start in Gnome 40, more and more applications use GTK4 toolkit for rendering their user interface. So, you have modern apps with rounded (bottom) corners and classic GTK3 and Qt apps with sharp (bottom) corners.
To make your system apps look consistent, this project is created and works on Ubuntu 22.04, Fedora 35/36, Arch Linux, Manjaro Linux with GNOME.