Hi, I use Firefox all the time, love it. But I have noticed a problem. If I have say 7 tabs open, none of them doing anything, then go away from my laptop for say 20 minutes, when I come back the fans on the laptop are screaming. Even if it was minimise. I have a fairly modern laptop Dell GSeries1522, 12th gen processor, 16gb ram, i7. I have tested this issue using Edge and Chrome with exactly the same tabs open and the laptop is all quiet. I'm on the precipice of moving to Edge. Happy to provide more information. Task Manager now shows FF using 1223.0mb of memory, Edge 466.7mb. They are both in "efficiency mode". Any help or advice would be great. Peter Hall Brisbane, Australia.