Rated 4 out of 5 stars
This is a great plugin for anyone who uses Firefox's native bookmarks. It is working for Firefox 13 on both OS X, Windows 7 and XFree86 on linux - only when the plugin is downloaded and modified. If it was properly updated for latest versions of Firefox it would receive a 5 star rating.
To be able to use this plugin in recent versions of firefox, the plugin can be downloaded from this URL:
Afterwards you need to change the maxVersion variable in the install.rdf so it meets the current Firefox version. Please google for a complete guide to this.