404-me-not saves you time by making it extremely easy to search for missing webpages. It will search both the Wayback Machine (a huge database of archived pages) and whatever search engine you choose, using the last part of the URL and keywords you supply as clues.
Searches are triggered by clicking Ok on a popup that automatically shows when a 404 error (page not found) is detected or by dragging the offending link (and optionally the highlighted link text; this requires another extension).
Note: As explained in the demo video, 404-me-not is open source and does not report data about the sites you visit to anyone.
Changelog
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v. 1.1.0 -- If install is an update don't display options.
v. 1.0.0 -- Code cleanup. Changed parsing behavior so trailing URL slash, page extension, and query strings are always ignored.
Extore is a team of professionals who are passionate about creating extensions for web browsers. This devotion also gives us opportunity to appreciate work of other people. We get inspired by useful, open source extensions made by developers all over the world. Our strong belief is that one should share helpful add-ons with others. That’s why we’d like to present you our ever-growing list of favourite extensions that have inspired us. Moreover, as you probably have already learned, sometimes struggling for the best brings an end to the good. Talking about add-ons it often turns out that an upgrade is worse then previous version. Also it can become really tricky to get back to the beloved version of your favourite extension. That’s why we’re going to make not only the latest, but all versions of our favourite (and we hope yours too) add-ons available for download. No more compromises, just stick to the version you really like!