Firefox is extremely slow to shutdown

For me this a very annoying problem!
Firefox is '''extremely slow''' to shutdown, and I can't imagine what is it doing for so long after I have closed all frames and windows (note that I am '''not '''requesting to save the session).
I tried the solutions posted in older posts (https://support.mozilla.com/it/questions/809195) with no effect. The only add-ons that I have active are the Norton tools (I have Norton Internet Security 2011) and NoScript, plus sometimes Downloadhelper,
but I tried to disable everything and the problem remains, so it's something in the Firefox core.
After a short navigation the delay in closing Firefox is tolerable, but after having surfed the net for a while the delay may get huge, like 5' or even 10'! It's incredible!
The process monitor displays a firefox process taking a lot of memory (> 500 MB sometimes) and many plugin-container processes that also take a long time to close.
Before shutting down firefox requests even more memory, so that the allocated memory has a peak, then it finally drops.
Another strange thing is that if I kill the firefox process I get the memory quickly freed without any apparent damage, so what?
This problem has showed up with the latest versions of Firefox (4 and 5), I don't remember such a behavior one year ago or more.
I would appreciate very much some help and insight from someone of the developers, as well as feedback from other users, of course.

Are you using Clear Recent History to clear the Cookies when you close Firefox?
*https://support.mozilla.com/kb/Clear+Recent+History
That can cause plugin-container processes to appear that Firefox opens to clear cookies from plugins.

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'''Note:''' You might want to print these steps or view them in another browser.
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Firefox is extremely slow to shutdown

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