Cinnamon Applet for Pinned Apps and Previews developed on Arch Linux
Copy the WindowListGroup@bcdev.arch@gmail.com folder to ~/.local/share/cinnamon/applets/
settings are in the right click menu of favorites if favorites are enabled else it's in the normal right click list
website: https://github.com/BartonCline/WindowIconList/
Due to additions that essenially "brand" the Applet with dedicated Firefox functionality, breaking changes and slow development, I've forked https://github.com/jake-phy/WindowIconList/ prior to any commits by jake and others. I've merged in some of the fixes provided by those contributors and will strive for a release in the near future.
Original code can be found at https://github.com/siefkenj/gnome-shell-windowlist/
Original extension here https://extensions.gnome.org/extension/25/window-list/