OK Except that.. Rated 3 out of 5 stars
When I first used this, I thought it was a great idea for my slow 1GZ PC. Unloading background tabs is good to relieve the cpu so that the current page loads faster but to see the other tabs, they have to be reloaded "All-Over-Again!!" It's a better idea just to 'stop' them after X secs, instead of unloading them and to continue loading when clicked on.
Rated 5 out of 5 stars
Beautiful app stops tabs loading all at once. Essential if you have a slow PC.
A future suggestion is to distinguish between tabs that open in the background (which optionally be loaded in their 'entirety' even if a timer has been set) and tabs which you 'leave' from (which are affected by the timer).