GNOME Extensions do not install on Debian

I'm trying to install true-color-invert available at the GNOME Extensions website or similar tools . It does not appear in the Extensions application on my Debian nor the gnome-extensions list which returns "Extension... Does Not Exists". 1. downloaded for shell version 3.38 extension version 11, because gnome-shell --version returns GNOME Shell version is 3.38.6. 2. unzipped, and made sure the directory of the unzipped files had the same name as the uuid in metadata.json : true-color-invert@jackkenney. 3. moved the directory to the folder of system-wide extensions : /usr/share/gnome-shell/extensions/, where I also affirmed the location of extensions readily appearing in the Extensions application. 4. reboot **What I tried:** - I also tried creating the directory ~/.local/share/gnome-shell/extensions/ and putting the extension here. - gnome-extensions install true-color-invertjackkenney.v11.shell-extension.zip [5] gave similar result as edit 1. did make the extension available. Other report similar issues. [6] [7] - it also does not install using preinstalled chrome-gnome-shell and the to-be installed browser extension for Firefox, although the website prompts "Your native host connector do not support following APIs: v6." that some say nevertheless should not be an issue on Ubuntu . - I tried multiple different extensions on the GNOME web. None worked. Someone has written at program at github that arguably fixes it , but I am a bit hesitant. - tried installing flatpak, then Extension Manager. But packages still won't install. What am I missing?