Window on Top

Window on Top is an extension for the GNOME desktop environment that provides a top panel button for toggling the 'Always on Top' mode for windows.

Installation

Gnome Extensions

One-click install via the official Gnome Shell Extensions resource page here.

Manual Install

Download the latest release.
Extract the downloaded file into the extensions directory unzip window-on-top.zip -d ~/.local/share/gnome-shell/extensions/.
Reload the Gnome Shell by pressing ALT+F2 and entering r (You have to logout and log back in, in case of using Wayland).
Activate the extension using the Extensions app or a similar extension management tool.