This one was driving me nuts and I finally found a solution. For several weeks, Thunderbird has not been opening links I click on them. I found a solution here: http://ubuntuforums.org/showthread.php?t=502651

1. Open Thunderbird version 2.0.0.14
2. Go to the Edit menu
3. Click on Preferences
4. Click the Advanced tab
5. Click the Config Editor button.
6. An about:config window will open up.
7. In the Filter box, enter network.protocol-handler.app.http
8. If the editor is unable to locate it, create a new string and input network.protocol-handler.app.http.
9. Enter firefox for the string value.
10. Close out and restart Thunderbird.

Hyperlinks should now be available in your email!

I found a really handy extension for T-Bird today. This add-on gives you the ability to import and export V-Cards from Thunderbird. It’s called MoreColsForAddressBook. What you get after installation are three more items under the tools menu:

Action for Contacts
Action for List
Action for Address Book

The Action for Contacts menu is the one that gave me the functionality I desperately needed. I am now able to import VCFs from people that send them.

I haven’t experimented with the list and address book menus, but will when the functionality is needed.

MoreColsForAddressBook is available at https://nic-nac-project.de/~kaosmos/morecols-en.html.