Install Indicator Multiload - the equivalent to system monitor from 10.10

sudo add-apt-repository ppa:indicator-multiload/stable-daily
sudo apt-get update
sudo apt-get install indicator-multiload

The following allows clicking on URLs in thunderbird and having Firefox come to the foreground
sudo apt-get install compizconfig-settings-manager
Compiz Settings Manager > General Options -> Focus & Raise Behaviour, and set the Focus Prevention Level to Off.

Install Gnome 3 Desktop

sudo add-apt-repository ppa:gnome3-team/gnome3
sudo apt-get update
sudo apt-get install gnome-shell

Install System Monitor

sudo apt-get install libgtop2-dev
Logout
Login and then install
https://extensions.gnome.org/extension/120/system-monitor/

Remove Accessibility menu
https://extensions.gnome.org/extension/112/remove-accesibility/

Install Gnome Tweak Tool
sudo apt-get install gnome-tweak-tool

Add Advanced Settings to the menu
https://extensions.gnome.org/extension/130/advanced-settings-in-usermenu/

Change Shell->Arrangements of buttons on the titlebar to All

Install Alternate-Tab
https://extensions.gnome.org/extension/15/alternatetab/

Install Alternative Status Menu
https://extensions.gnome.org/extension/5/alternative-status-menu/