Firefox 3.6.8 hangs/extremely slow in Win 7

When the desktop icon is selected, Firefox is extremely slow coming up. When any icon such as help or add-ons is selected it is very slow to respond. Everything in the browser is frozen for a period of time.

Thanks for your response.
I have tried all the solutions from MJB's post. I have also tried Firefox in Safe Mode. Same problem. With the same add ons, I had no problems 2 versions back... the previous version had the issue of far too much memory usage, but this version 3.6.8 has the memory problem and the incessant hanging/freezing.
fyi, my laptop is dual core, windows 7, w/ 3 gb memory.

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