I've gone thu all of the tweeks to get firefox to use less cpu, but its still a hog since i upgraded to maverick

since i upgraded to maverick, firefox uses btwn 30 -60% of cpu causing my whole system to run sluggish. i've gone thru all the tweeks suggested with no improvement.
safari, on the other hand, uses 10-15% cpu.
what is the problem?

i updated to ff25 (i am on auto update, however, it was not updated) & it seems to help some. (cpu runs a little lower, but still spikes in the 60% range) compared to safari which doesn't seem to hog as much.

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