Ever wanted to check to see if a page is cached by Google yet or not?
Now you could search Google for cache:yourdomain.com or you could use an extension to get this ability added to your status bar. Google Cache Checker, currently an experimental add-on for Firefox, displays a checkmark icon if the current page is Google cached. If it is not, the extension displays a red X.
The result is immediately shown conveniently in the browser status bar. Where would this be handy to have? Well, let’s say your viewing a web site that is currently down. By viewing the cache (if it exists) you could at least see what it looked like before it went down. You can download the add-on from the Firefox Add-ons web site or get more information from the official web site.