Very usefull... low battery, less energy use... An otpion to automate it on all Windows oppened would be greater. Thanks

WOW...WOW...WOW
This is what I have needed all along... Firefox has been killing my cpu, memory and very much my battery... this addon is perfect. you may need to shutdown and turn on your laptop because I did not get any affect until I did this.. you do need to click on the addon and press start!
Truly amazing!!!! my cpu fan is off and I am running a i9 mac and bottom case of the laptop is so cool for the first time I can remember!!!
Thank you thank you thank you!!!

Very nice. Thanks matico !

Just started using this and set the timer for 0 minutes. The results are remarkably good. I constantly monitor my RAM & CPU usage, and the RAM has dropped by over 50%.

So far I am very impressed.

I was considering dropping the use of Firefox for Chrome, due to its massive memory leak issues. But now I will stay with Firefox a little longer, as Ive used it for 10 years and love all the useful addons.

Only suggestion is make an option to have IE last 2 tabs open. so when i'm working in WordPress and my website, i can switch back and forth between last 2 tabs without a delay in waking them up.

Thanks dude!

Could you add an option to set a delay for when the tabs go to sleep?