I followed the tutorial here to install all the necessary packages to use gnome extensions on Firefox, Ubuntu 18.04. However, when I opened the website, it returned an error Although GNOME Shell integration extension is running, native host connector is not detected. Refer documentation for instructions about installing connector.
I double checked the chrome-gnome-shell, which returned chrome-gnome-shell is already the newest version (10-1).
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Is there any solution for this situation? Many thanks in advance.