Firefox: If you're all about keeping a tidy bookmarks file, Incredible Bookmarks is a Firefox extension packed with features to help you sort, organise, check and colour code your bookmarks.
Incredible Bookmarks comes with a variety of tools for helping you keep your bookmarks file clean and streamlined. You can colour code individual bookmarks and folders and you can easily create custom toolbars based on the task at hand—toggling them on only when you need them.
Perhaps the most handy feature even if you're not bent on colour coding and tagging all your bookmarks is check for duplicates and expired links. Any bookmarks folder, sub-folder, or toolbar can be scanned for duplicate bookmarks—as seen in the screenshot above—or for expired bookmarks. Check out the video below to see Incredible Bookmarks in use.
You can jump right to the Mozilla page for Incredible Bookmarks here or visit the link below for additional information. Have a bookmark tool—Firefox-centric or otherwise—you love? Let's hear about it in the comments.