Mr Uptime :: Firefox Add-onsMr Uptime 0.9.3 by Pingdom Categories Alerts & Updates Have you ever tried accessing a website and it didn’t respond? Of course you have. We all have! 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 Up
