When a website is taken down due to some technical difficulties such as memory overload or some other issues, you will be shown a Page Not Found error. But the fact is that Google routinely crawls the web and adds every new page to it’s cache. So when a website goes down you can still access the cache version using Google.
GCache+ is an extension for Firefox that makes viewing cached pages more easy. All it does is add GCache Page option to the right-click context menu. Next time if you visit a website that goes dead due to large amount of traffic or is removed by the author, simply hit CTRL+SHIFT+ALT+G to view the cached version of the page from Google. You can also right-click anywhere on the page and select GCache Page.
Ofcourse there are other services too that crawl the web and adds cached versions of pages, but Google is the fastest so far due to it’s awesome bot that crawls the web multiple times a day.
It works on all versions of Firefox after 2.0, including the latest 3.5. The add-on is cross-compatible which means that it works on Linux, Windows, and Mac. Enjoy!