That’s where the new Firefox add-on History Tree comes into play. History Tree can generated a tree structure from the Firefox history in realtime. It can either visualize the history of one tab at a time or all tabs at once.

The name and time of each website are displayed in rectangles on the screen. Connections visualize that websites have been opened after each other. A color code is being used to provide additional information:

• Orange: Active Firefox Tab
• Yellow: Open Tabs
• Blue: Closed Tabs
• White: Pages that can be accessed with the back and forward buttons in Firefox
• Gray: Pages that cannot be accessed with the back and forward buttons

A click on the question mark will display a preview screenshot of the selected website on the same screen while a click on the triangle hides the sub-pages from the display and replacing them with a number representing their amount. Websites can be opened by left-clicking on their boxes in the history tree window.

Filters are available on top to display specific tabs only. Those can be open tabs, open pages, selected tabs or closed tabs. A search aids the user in finding information faster.

It is furthermore possible to change the tree view to a thumbnail view of the visited websites instead. This will display all websites as thumbnail images in the same window.

History Tree distinguishes between different Firefox windows, something that the default Firefox history manager is not offering as it only displays a combination of all visited pages regardless of the window they have been opened in.

One thing that would be nice would be the configuration of a default action when left-clicking on a thumbnail or box in the History Tree window so that users could open sites with just one click instead of having to work with the selection box all the time.