Rated 4 out of 5 stars

Good add-on. The default search string is applied to ALL addressbooks. It took about five minutes after installing the addon for the search string to be applied. If you have contacts in your addressbook that don't have email addresses, like for example just a name and phone number it would be difficult to apply a search string that would return ALL entries. If you click the 'x' in the addressbook search box, it clears the default search string so you can see all your entries if you have contacts without email address.
I was hoping it would apply the search string to the Contacts Sidebar but it does not. However this is not a shortcoming of the add-on but rather a compatibility issue. I don't expect it to work with other add-ons.
Would be cool if it was able to be applied only to certain addressbooks.