I am also experiencing this problem in Firefox 3.0.7 when Gmail and Google Reader are open, Maybe it is caused by javascript-heavy sites? This is on Kubuntu jaunty, 2.6.28-8-generic.
I am also experiencing this problem in Firefox 3.0.7 when Gmail and Google Reader are open, Maybe it is caused by javascript-heavy sites? This is on Kubuntu jaunty, 2.6.28-8-generic.