Find any page you have visited quickly and easily. Shows your browsing history as a tree of tabs, with thumbnail screenshots of the web-pages in every tab you have opened.
Via Hacker News [1], “History Tree 1.0 [2]”
I remember talking about a browser history mechanism [3] like this seven years ago. I'm surprised it's taken this long to implement this.
I'm also surprised that there can be Firefox [4] extensions that are operating system specific (in this case, Windows only—sigh).
[1] http://news.ycombinator.com/item?id=803107
[2] https://addons.mozilla.org/en-