Even after running in Safe mode Firefox is too slow ,why?

I am using the latest version 22 of Firefox. I have tried running in Safe Mode I am running on Vista Home 32bit 2Gb RAM It seems to be using an average of at least 200mb of memory more when not in Safe Mode However it is still using loads of memory and CPU - twice as much as Internet Explorer. I don't know why, but I am going to have to leave Firefox if it continues, as too much for my PC.

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