Why does Firefox fail at giving me back all my memory when I close tabs?

When I use Firefox, I typically have 5 to 10 sessions (or windows) open. I have accounts at several sites and login at beginning of day. As more session windows are opened, I notice Firefox getting slower. Firefox gets so slow that wait time is on order of a minute to open a new session or go to a new location at some web site. If I close all sessions/windows and restart Firefox, performance is fast. Then, with task manager, I notice that when Firefox is slowest, it has consumed lots of memory, 250,000k. Even if I close all sessions, the memory remains about same. If I restart Firefox, at first session, memory allocation is about 55,000k. Is there a way to define internal settings in Firefox to get release of memory when sessions are closed? This would eliminate the need to close down Firefox and restart.

There have been problems reported with Sync and they are working on it, so please try again later if you experience problems.
*https://services.mozilla.com/status/
*http://twitter.com/#!/mozservices

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