Forked from https://github.com/climaxx/Nautilus-Status-Bar-Replacement (updated to work with Python3) Tested on Gnome 3.38
Nautilus Python extension that shows in a textbox the disk space left when viewing a file or folder. This is a replacement of the old status bar that existed in previous versions of Nautilus
Copy the extension file DiskUsageLocationWidget.py in one of the following directories: /usr/share/nautilus-python/extensions/ or ~/.local/share/nautilus-python/extensions/