Mr Uptime

Mr. Uptime is a Firefox browser extension that helps you keep track of websites that are not running. Just add the websites you want to monitor to the list and Mr. Uptime will check them regularly and notify you when they are up and running again.

Mr. Uptime has a number of features to help you monitor websites more efficiently. For example, you can set Mr. Uptime to notify you when a website is live or to open it in a new window or panel. Mr. Uptime also displays a history of website checks, so you can see when they were last checked and whether they are live.