Google Group: http://groups.google.com/group/matchbook-firefox
(Please use this forum to post questions, comments and issues. No longer use the Reviews to post bugs. Thanks)
This extension will read in the selected text, and parse out contact information (name, email, phone, etc.).
Select the desired text block, and then right-click and select "Parse Contact..." from the menu. A dialog will popup where you can edit the information.
Then click "Save" to store the info to a .VCF (VCard) file on your computer.
The parsing framework uses RegExp's and is extensible, but at the moment, it's not too terribly advanced. (Only handling basic US addresses). I will enhance the capabilities as I develop further.
For advanced users, there is a Preferences dialog where you can modify the regular expressions to suit your needs.