Yes it does work with Firefox 4! Rated 5 out of 5 stars

WOW. This was just what I've been looking for. Before I found this add-on, I was annoyed with firefox because there was no easy way for me to determine where a searched bookmark was located. I'd have to export my bookmark to html then search the html. This add-on this is a major time saver. Thank you so much for your contribution!! BTW, this works with Firefox 4!

This review is for a previous version of the add-on (1.8.1-signed.1-signed).