Traveling to a link you want to check out, only to find that you reach the dreaded 404 (file not found) is a pain in the browser. Let say you bookmark a link, think you might read it later and then when you finally get the time to a few months later the page is gone. Well if you have Firefox there is new 404 extension that could help you recover your lost page.
Getting an award for the longest extension name ever, 404 : Page is Not Found ? Now it will be! will give you an “archive” button to push when you get your next 404 error page. This button will show you an archived version of any page. Under the hood it looks to be using the Wayback search at archive.org, so not all 404s will be recoverable. It is a very creative idea though, worth checking out if your find yourself running into dead ends a lot these days.