"Although GNOME Shell integration extension is running, native host connector is not detected" error in 22.04

Question

I upgraded my system from Ubuntu 20.04 LTS to 22.04 LTS and I'm now facing this error on the GNOME Shell extensions webpage:

This was solved in previous versions, and I have tried these solutions:

• Although GNOME Shell integration extension is running, native host connector is not detected
• URL extensions.gnome.org for managing GNOME Extensions not working in any browser

However, they don't seem to work anymore.

How can I fix this?

Answer 1

Ubuntu 22.04 forces the Firefox Snap default for everyone, across every flavour. Starting from Ubuntu 22.04.3, the Snap version of Firefox works with the Gnome Extensions website simply installing the connector (sudo apt install chrome-gnome-shell) and then install the Firefox add-on when prompted by the extensions.gnome.org website.

If you don't want or you can't use the connector, you can install Gnome Shell extensions manually as in this answer by vanadium, but you have also an alternative: the Extension Manager app has been made available starting from jammy release . It is a native tool for browsing, installing, and managing GNOME Shell Extensions written with GTK 4 and libadwaita.

It is available in Ubuntu universe repo but also as a flatpak app.

The tool supports (copy paste from the GitHub page):

• Browsing and searching extensions from extensions.gnome.org
• Installation and Removal
• Enabling and Disabling
• Updating in-app
• Screenshots & Images
• Ratings & Comments
• Translations

You can install it running in a terminal sudo apt install gnome-shell-extension-manager or following the instructions in the GitHub page

Answer 2

After the upgrade, your Firefox browser was changed to a snap version. One of the current issues with the snap version is that the Gnome Shell extensions website does not work.

Extension manager desktop application

Update: with Ubuntu 22.04, a new graphical tool was included in the standard Ubuntu software repositories, Extension Manager. Thus, it can now be very easily installed in Ubuntu 22.04 from Software Store, and offers a graphical desktop application that provides much of the functionality of the Gnome Shell extensions website. See the answer of Lorenz Keel for more details.

Download and manual installation

Gnome Shell extensions can be installed manually. While one can manually put the files in place to install it, the easiest and most fool-proof way is to use the gnome-extensions command line tool:

1. Download the zip archive of the extension from the Gnome Shell Extensions website. You can do so by selecting your Gnome Shell version from the dropdown field next to "Download" (42 for Ubuntu 22.04). That will cause a second drop down to appear to select the version of the extension. Once you select that, download will proceed immediately.
2. Find the downloaded archive in your file manager. By default, Firefox will download to the Downloads folder, but that can be set up differently.
3. Once you see the downloaded file in your file manager, select "Open terminal here". That will open the terminal into that directory. Alternatively, open the terminal and use the cd command to change the directory, e.g. cd ~/Downloads to make the Downloads folder the current directory.
4. Install the extension with the command

   gnome-extensions install -f <name of downloaded zip file>.zip 
   

Tip: Use tab completion. Type gnome-extTab to autocomplete the command name, then insTab to autocomplete "install", then the first few letters of the file name and Tab to autocomplete the file name.

To turn extensions on and of, install the Extensions tool: sudo apt install gnome-shell-extension-prefs