You will need to go to the Thunderbird Menu and scroll to Add-ons
From there, you will want to search for gContactSync by entering it in the Search Add-ons box in the upper right hand corner:
Hit Enter and it will list off Add-ons, the one you will want will look like this:
Click on the Install button on the right of this. In a moment, you will see some text on this bar saying you will need to restart Thunderbird with a Restart now link next to it:
Click on Restart now and let Thunderbird restart. When it comes back up, it will show the following window:
Confirm the account it should sync with, (IE: Your UCSB Connect Email) and click Next.
This will bring up a Google Authentication window:
Enter your UCSB Connect Email and click on the Next button.
Next, it will want to confirm that you wish to allow gContactSync to manage your contacts. Click on Allow.
Next, is just a confirmation of which Address book you want to synchronize on Thunderbird with which Groups and Contacts on your UCSB Connect Account and how you want the Sync to work.
Once that has been decided, just click on Finish to complete the setup.
UCSB Connect Contacts does not handle Thunderbird Lists (Group sending)
By default, the gContactSync system will auto sync Contacts every 2 hours. If you wish to change this behavior, you will need to go into Address Book, go under gContactSync, Preferences and change the Synchronize Interval (minutes) from 120 to a lower or higher number. We recommend no lower than 15 minutes.
You can use the Sync option to sync your contacts right that moment as another option.