Why does FireFox remain running and eating up full system resources everytime it crashes and 90% of the time when I close it manually?

I've been having a problem with FireFox on any machine/OS I use it on ever since v3.3. When it crashes, it will remain running in the task manager eating full resources which is often in excess of 1gb memory consumed. When I close the browser manually, it will remain running in the task manager, also eating full resources, about 90% of the time. This happens on at least 4 different computers I use on a weekly basis and it's extremely frustrating. I'm no computer expert, but what in the world could it be doing in the background when I have closed it that required over a gig of memory? Is this a normal problem? Is FireFox using people's computers/bandwidth for some sort of Grid computing project without the users being made aware of it? I love FireFox, but I'm no longer recommending it to anyone until this issue is resolved. I've spoken to several other people who've noticed the same thing, so this is not an isolated problem.

Other things that need your attention:
Your above posted system details show outdated plugin(s) with known security and stability risks that you should update.
# Shockwave Flash 10.1 r85
# Java Plug-in 1.6.0_06 for Netscape Navigator (DLL Helper)
Update the [[Managing the Flash plugin|Flash]] plugin to the latest version.
*http://www.adobe.com/software/flash/about/
Update the [[Java]] plugin to the latest version.
*http://www.oracle.com/technetwork/java/javase/downloads/index.html (Java Platform: Download JRE)

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Why does FireFox remain running and eating up full system resources everytime it crashes and 90% of the time when I close it manually?

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