robytrevi/Gnome-shell-extension-LeftMessageTray — comment on commit 9d39f3f9ba145462cba692c0bc24d94e6e0c8361
File: README line 2
By robytrevi:

Put the LeftMessageTray@robytrevi.net folder containing the extension.js and metadata.json files in .local/share/gnome-shell/extensions folder, replace the shell and activate the extension.