No matter how hard you try, sooner or later keeping your bookmarks in Firefox organized, never remain that way. Eventually the time comes when you need to but them back in order only to find a mess and duplicate bookmarks all over the place. Fortunately cleaning up bookmarks can be quick using the Bookmark Duplicate Detector add-on.
Once Bookmark Duplicate Detector add-on is installed, additions to the menus will appear under Bookmarks \ Search for duplicates:
and under Tools:
A Shortcut is also added to the Bookmark Manager toolbar.
Starting with Tools \ BookmarkDD Options you can configure and change the default settings as needed in the Options tab or change the notifications and automatic bookmark deletions in the Duplicate tab. The Backup tab allows you to create a backup of your Firefox bookmarks before you start deleting duplicate bookmarks.
To delete duplicates, click Bookmarks \ Search for duplicates. The Manage duplicate bookmarks window will appear and display all duplicates. Selecting each duplicate will show you the folder locations of the URL (bottom) and allow you to select which folder you want to delete the duplicate from by clicking Remove.
As you surf the Internet and bookmark web site pages, any duplicates that are detected will pop up with a Confirm window asking you to OK, Move to another folder or Cancel.
When the time comes for cleaning up your bookmarks, adding Bookmark Duplicate Detector is one tool that will speed up the process as you get organized. For help with other bookmark management, check out how to locate missing Firefox bookmarks you knew existed somewhere!