Was wondering if anyone else noticed this. I've been running FF 63 for over 24 hours now. And its not sluggish at all and memory usage is staying under 5gigs. Not sure when it does it. But after a certain time or when memory gets too high. It resets it. The memory usage drops way back down. I get no sluggishness at all. Normally after 24 hours it so sluggish I have to restart it or risk having it crash.