[gnome] Can't Install GNOME Extensions

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http://ubuntuforums.org – I'm using GNOME Shell and up until recently I could install extensions fine using https://extensions.gnome.org/ But now I can't seem to install any. If I click on the slider to install one, it switches to "On" but there is no confirmation to install and it doesn't install. I can install extensions if I can find them on GitHub and download as a .zip and install through Advanced Settings - but there are rarely links to manual installs. Any ideas as to a fix? I saw somewhere to reinstall gnome-common, but that didn't fix it. (Hardware)