Reveal is a Firefox extension that allows you to see thumbnails of pages in your history by mousing over the back and forward buttons. With many tabs open, quickly find the page you want, by pressing F2. Reveal also has a rectangular magnifying glass you can use to zoom in on areas of any web page.

Reveal features:

• Sorting - Alphabetical, chronological, etc.
• Window mode - See thumbnails of other open windows.
• Saved searches - Save your favorite searches and assign them to key combos.
• Full history accounting - Track global history, like in Trailblazer.