If you are using popular, open-source email application Thunderbird then importing and exporting your gmail contacts could cause you lot of trouble. Zindus Firefox add-on takes care of all these for you.
Zindus allows you to:
- Synchronize Gmail contact list with thunderbird.
- Not only Google contacts, but lets you manage Personal Address book.
- Lets you have control over shared address books
- Makes a copy of your Gmail contact in your hard disk. So don’t worry about backup.