I have a MacBook in Leopard 10.5.6, running Firefox 3.0.6, and my scrolling varies from extra fast (like continuing to scroll long past when I stop) to super slow and sluggish. I've tried updating and adjusting preferences and have no add ons besides Ad Blocker and I can't figure out why this is happening no matter what forum I go on. Is anyone else having this problem? It's gotten so that Firefox is completely unusable for me and I've had to switch to Camino, when I much prefer the utilities on Firefox.