Visual bookmarks for Firefox. (Works with all latest versions of Firefox)
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You can choose items displayed in the sidebar.
This extension did not work in MacOS X.
Add shortcuts to any file or folder for a faster and easier access.
Detects Duplicate Bookmarks when bookmarks are added and specify where is the previous URL. You can also search and delete duplicates URL already in your Bookmarks.
Firefox 13 support is available from http://bookmarkdd.mozdev.org in version 1.1.1.