This is a perfect plugin for someone who does constant reviews so I'm glad I got it to work on Ubuntu 20.04.2 Lts. The way I could only get it working is to clone it directly like you mentioned and then "install" it again from the gnome extensions site. Cloning it alone wouldn't show up in the gnome extensions menu and installing it from the site without cloning it first resulted in a error msg
No JS module found 'github.notifications@alexandre.dufournet.gmail.com` ...
This is a perfect plugin for someone who does constant reviews so I'm glad I got it to work on Ubuntu 20.04.2 Lts. The way I could only get it working is to clone it directly like you mentioned and then "install" it again from the gnome extensions site. Cloning it alone wouldn't show up in the gnome extensions menu and installing it from the site without cloning it first resulted in a error msg
No JS module found 'github.notifications@alexandre.dufournet.gmail.com` ...