Convoluted and doesn't work. Use MozBackup instead Rated 1 out of 5 stars
I used this add-on to back up my extensions and bookmarks to transfer to a new Vista PC a few weeks back.
Not only was it confusing to use, (just try restoring a profile once) but it simply didn't work.
I finally gave up with it when I found myself spending more time fiddling with it, than it would have taken to search for all my favorite extensions, reinstall and configure them. Which is exactly what I did.
Fortunately I made a manual backup of my bookmarks - just in case...glad I did.
This add-on is good in theory, but needs some work with usability/reliability. Not being able to restore my extensions was bad enough, but if I would have lost my irreplaceable bookmarks, I'd have been spitting fire on this post.
I now use MozBackup, which is extremely easy to use and works perfectly for FF3 and TBird.
Download it here: