Gnome Extensions can no longer be installed via Firefox in Ubuntu 22.04 because:

• Firefox is now a snap by default
• Snaps run in sandboxed mode
• As a result Firefox Snap Gnome Shell Integration Addon can’t connect to the local Gnome Shell Connector
• This occurs even if you follow all the installation steps for the addon, and the connector

Instead extensions can be installed manually from a zip file.

Instructions

I’ll be using Bluetooth Quick Connect as an example.

1. Download an extension from https://extensions.gnome.org
2. Check the extension metadata for UUID

unzip -c ~/Downloads/bluetooth-quick-connectbjarosze.gmail.com.v29.shell-extension.zip metadata.json | grep uuid | cut -d \" -f4bluetooth-quick-connect@bjarosze.gmail.com

3. Extract the file into ~/.local/share/gnome-shell/extensions/<extension UUID>

unzip -q bluetooth-quick-connectbjarosze.gmail.com.v29.shell-extension.zip -d ~/.local/share/gnome-shell/extensions/bluetooth-quick-connect@bjarosze.gmail.com

4. Restart gnome shell

killall gnome-shell

5. Open Gnome Extensions UI — the new extension will be visible and can now be further enabled and configured

Sources:

• Manual Installation of GNOME Extension from ZIP File
• How to install Gnome Shell Extensions from ZIP file using command line on Ubuntu 18.04 Bionic Beaver Linux

More reading:

• Snaps in Ubuntu Core
• Ubuntu 22.04 Jammy Jellyfish