I've noticed recently that sometimes if I have over 10 tabs open in Firefox my fans speed up to 5000RPM. I check Activity Monitor and CPU for Firefox is at 100%. Even if I close all tabs except for one, fans will run high and CPU will remain 100% until I close Firefox. Besides this, opening the Application folder is pretty slow, takes 10 seconds to display. I've done repair disk permissions, but perhaps I should try Techtool Pro as well. Anyone else have any suggestions?