Categorize (formerly Bookmarks Plus) is a Firefox addon, it gives you the ability to easily manage your bookmarks. Categorize is an advanced bookmarking system. It uses categories for organizing bookmarks. Categories subsume both tags and folders. Categorize also provides groups and enhanced keywords.
These features allow multiple sites to be visited/searched easily. Categorize comes with an implementation of tab groups too. Tab groups allow large number of tabs to be managed easily.

Categorize (formerly Bookmarks Plus) Features:
1. Categories
Happen to know someone with 14,238 bookmarks organized in 7,773 folders? Must be some psychotic bookmarking freak with a nasty folder fetish! Glad that you do not know any such person? Actually, now you do. So why that many folders? Well, this is the organization you get when you have the best mechanism for organizing bookmarks invented to date. Categories are super-charged folders with the convenience of tags. Like tags, categories do not need to be created before use, but unlike tags, they have structure. In fact, categories completely subsume both folders and tags. Assigning bookmarks to categories involves searching for the appropriate category and the process is simpler than tagging. As an added bonus, more categories imply less bookmarking effort and that explains the 7,773 categories in my bookmarking database.

2. Groups
With Groups you can open any number of your favorite bookmarks with a mouse click. Opening fifty tabs is now as easy as opening just one.

3. Tab-sets
There is no point in having the ability to open fifty tabs if you are going to drop dead of information overload :-( Fortunately, Categorize Tab-sets are there to help save your life :-) They make it a cinch to manage even upwards of fifty tabs in a single window.

4. Quick Search Toolbar
If you like the Firefox Findbar, you will love the Categorize Quick Search Toolbar. In Firefox, the / key opens the Findbar. Categorize builds on that. With Categorize holding the Shift key along with the / key pops the Quick Search Toolbar. This toolbar has all the functionality of the searchbar. It lets you quickly type keywords or perform web-searches. Best of all, when you hit Enter, it does the specified action and disappears.

Requirements:
* Firefox

The license of this software is Freeware, you can free download and free use this bookmark manager software.