I wish to install some extensions from https://extensions.gnome.org/. So here is a history of what I did. I install ubuntu 16.04.3 LTS. Successfully done. Now I installed gnome on it using the commands-
$ sudo apt update && sudo apt upgrade $ sudo apt-get install ubuntu-gnome-desktop $ sudo apt-get install chrome-gnome-shell
Last command just to ensure that it is installed (usually it is installed by default). I chose gdb3 on prompt while running the second command. Here are the info. with respect to the versions-
$ gnome-shell --version GNOME Shell 3.18.5 $ firefox --version Mozilla Firefox 57.0
Later on, I installed the firefox gnome-shell integration plugin from the firefox addons manager.
Even after logging out and rebooting, I am getting the following messages on firefox (my primary browser) and chrome respectively-
As a result, I can't install extensions from the site. Ask if any more info is needed. Please help!