History Tree is a nice add on for Firefox which lets you visualize your browsing history. It displays the websites in a hierarchical structure, hence the name History ‘tree’. It can show such four different history views, show you the screenshot of every page you’ve visited and even pages which you can no longer navigate using the back and forward buttons of the browser.


Although the add-on is currently in experimental mode, it’s got some great reviews and doesn’t appear to have any bugs at the moment.
Features:
- Visualize Firefox history in a tree based view.
- Get 4 different history views for different browser windows.
- Also get screenshots of pages you’ve visited.
- Experimental add-on but got some nice reviews.
You may also go through an alternative tool called About:me, it helps you understand which websites take most of your online time.
Check out HistoryTree @ addons.mozilla.org/en-US/firefox/addon/13316/ (By Abhijeet from Jeet Blog)