Featured Firefox Extension: View your history in thumbnails with ThumbStrips

Lifehacker:

Windows
with Firefox only: The ThumbStrips Firefox extension displays your
browsing history in a filmstrip-style series of thumbnail images.
(Click the image for a better view.)

You can browse your ThumbStrips history by clicking the statusbar
icon to toggle the ThumbStrips view, then using your mouse to
intuitively move back and forth through the history, filtering by sites
visited or by live keyword searching. If you don’t want ThumbStrips to
record for a while, you can start and stop recording at any time.
ThumbStrips is free to download, works only with Windows and Firefox.

ThumbStrips [Firefox Add-ons]