Pinger - Keep Your Bowser Awake
Pinger is a simple extension that keeps your computer from going to sleep due to browsing inactivity. It will ping any websites on demand, and your web browser is never slow while using it.
This free app is simple to use and works without any problems. Once it is installed, you only need to configure the time range in which you want to be pinging your sites. After that, all you have to do is to click the button that says "Start", and Pinger will start pinging.
The application offers a history of the pings that you performed as well as logs. The latter can be accessed from the browser itself.