Iceweasel 11 chewing up my CPU?

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http://crunchbanglinux.org – I'm running #! Statler 32-bit on an Acer Aspire 4710 laptop with Intel Core Duo 2.0GHz CPU and 1GB RAM. I have terminator open with one or two tabs, usually doing nothing, Emacs and Iceweasel with, at present, around 6 tabs open: GMail, Twitter and a few others. CPU usage is constantly above 1.00. I've been watching it for a few days now. top shows me firefox-bin, xorg and plugin-container as the top users. I have the following addons: firebug (not used 99% of the time), firemacs, NoScript, Readability (not used 99% of the time) and Tab Mix Plus. Since starting this message, usage lo (HowTos)