When viewing Craigslist listing, the addon shows preview images, text within the same windows. It let users send emails automatically on filtered items, send emails from saved drafts, create saved filters with keywords and prices, view post details, map location, map drive direction, and mark spam. There are many configurable options. The user interface is very easy to use, and customisable.
See the user guide
for all features and usages.
There is also a youtube video here for some of the Craigslist Fusion features:http://www.youtube.com/watch?v=8iXg1-0LE6c
Please post questions or bugs/issues here:http://userscripts.org/scripts/discuss/57662
Make sure you note that the issue is in FF Add-on.