As a web developer I’m almost always tasked with ensuring that websites and web applications I build not only work but look good in the popular browsers for the target platform. Sometimes you may get a client with some obscure version of a browser (not necessarily Internet Explorer, Firefox or Chrome) and you don’t have that platform available to test it locally to try and replicate the issue and hopefully fix it.
Through what I’m assuming are multiple virtual machines on their servers which are instructed to browse to the site you requested and then a screenshot is taken of that browser and added to your screenshot queue.
It will notify you of the progress, whether or not the browser screenshot will be available or approxiamtely how long it will be before your screenshot is queued and taken.
The site even allows you to download all the screenshots in a single ZIP file – how handy is that.
I’m definitely bookmarking this site for my next browser-compatibility issue resolution!