Install and uninstall gnome shell extensions


sudo apt-get install chrome-gnome-shell

Now go to
Install required extensions after downloading the browser extension. In case of firefox, you may need to disable extension compatibility checking.
You can control extensions and their settings from gnome-tweak-tool

In case of serious issues preventing booting:

apt-get install --reinstall gdm3 gnome gnome-shell

You may also want to move everything from ~/.local/share/gnome-shell/extensions

The lower left corner legacy icons are an irritation. To move them, install the GNOME shell extension TopIcons. This moves the legacy tray icons shown in this bar to the main GNOME bar, up in the top right by the menu.

You are reading this post on Joel G Mathew’s tech blog. Joel's personal blog is the Eyrie, hosted here.