Thanks to @ToasterUwU, a better and well-maintained fork exists at https://github.com/ToasterUwU/install-gnome-extensions
For whatever reason, if you would like to look at the last snapshot of this project, please click: https://github.com/cyfrost/install-gnome-extensions/tree/4cbc33ca9b858b83a3ffbd54be1877ba6565f5d0