Rated 4 out of 5 stars
This is a great idea, but even though it was just updated about 6 weeks ago, it already won't install in TB 53. Not much sense in using an Addon that may or may not be usable each time there's a version update. I edited the Install.rdf file so I could get a look at the Extension, and it definitely adds a convenience that is missing in TB. My personal preference is for the Contacts Sidebar extension, which is long out of date here on the Mozilla Addon site, though it can be downloaded from the authors web page. It is always visible from the main TB view, and it has several very useful functions beyond the obvious. It would be great if this addon had the option of being incorporated in the sidebar, but as I said, it is a nice convenience to have the Address Book handy on a tab as it is implemented here, instead of opening it each time in a separate window.This review is for a previous version of the add-on (1.2).