No matter of what version of firefox I use...(many years now, 2x, 3x, 4x ) No matter of what addons I use... No matter of the versions of addons... Regardless of osx version.... ...Firefox on my mac pushes my cpu to 100% usage! I use to have about 20 tabs open all the time, but this is not the case in c2d cpu, I think. So, when so many things (osx, addons versions, ff versions) changes, I really do not know what else to search for, in order to make my firefox have a normal cpu usage. Does this happens to you too? Any idea, whatever, about what to try in order to solve the problem?