Where was that page you were just looking at a few days ago? If you're a Firefox user, answering that question just got a lot simpler. Yes, the browser offers simple bookmarking and niceties like bookmark folders and multi-browser sync — and yes, there are hundreds of add-ons to help you categorize, tag, export, import, and file your links in every conceivable way. But all too often, re-finding that page you just took a casual look at is still easier to do with a Web search engine — and that's the premise behind RecallMonkey, which gives you a search-engine-like interface to your own browsing history.