Mr. Uptime is a Firefox extension which helps you to remain updated with the status of your favorite websites. It checks the status of your favorite websites which may have went down because of social-bookmarking effects, after regular intervals of time (every five minutes for the first 60 minutes, every 10 minutes for the next 120 minute, every 15 minutes for the next 180 minutes, every 30 minutes for the next 240 minutes and every 60 minutes after that).
Mr Uptime is an extension to your Firefox browser that will keep trying to reach that website in the background while you continue surfing on other websites. When the website is accessible again, Mr Uptime will let you know. You can also use Mr Uptime when a website responds but doesn?t load correctly.
Nice idea to keep people hanged up than just passing by, if website isn’t opening – anyone for Google Cache? I think, it is quite slow and doesn’t index websites so fast, but it can do that.