Mr Uptime is one of the Firefox plugins that I use and love.

Everybody has an experience with websites being unreachable because of web hosting or technical problems. After that, we may forget to check that website again or spend so much time to see whether it is online or not.

Mr Uptime simply informs the user when an unreachable website becomes reachable again.

Usage is also simple. When a website in unreachable at the time you’re trying to browse, a small menu appears which helps you to add the website to the watchlist with 1 click. Another nice feature is watching a website for a text parameter to appear too. If that text appears on the website Mr Uptime warns you.

With many different operating systems, many browsers and different browser versions the design of a website can look different to every user.

Testing your website in different browsers easily is possible.

Browsershots makes screenshots of your web design in different browsers. It is a free open-source online service created by Johann C. Rocholl. When you submit your web address, it will be added to the job queue. A number of distributed computers will open your website in their browser. Then they will make screenshots and upload them to the central server.