Firefox, resetting RAM in minimized mode

Recently, quite often hear about the incredible voracity of the Fire Fox. A lot of extensions (useful and not so) appear, and along with this, requests to resources of your machine are growing. For convenience you have to pay blood megs.

According to browser developers, the average PF load of FF users varies from 100Mb to 150Mb, the browser itself is designed in such a way that it optimizes its work according to computer resources - on strong machines memory consumption will be higher on weak ones, respectively, gluttony will be lower. On the Mozilla website there is an intelligent analysis of the possible causes of memory leaks and methods to combat this phenomenon.
The following solution seemed especially useful to me: resetting the RAM in minimized mode.
1) type in the address bar: about: config
2) right mouse click: New -> Boolean
3) then write to the pop-up line: config.trim_on_minimize
4) choose True
5) overload FF

result:
screen - 48 tabs open, from extensions: Greesmonkey, Google Notebook, Blue Organizer, del.Icio.us Bookmarks, Google Toolbar, StumbleUpon Toolbar, Better Gmail, Dom Inspector
Mem. usage: 167 Mb
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<img src = "http://img522.imageshack.us/img522/2717/memusageupzt5.th.jpg" border = "0" "/>

Screen FF in collapsed mode
Mem. usage: 56 Mb

<img src = "http://img176.imageshack.us/img176/4794/memusagedwnlc6.th.jpg" border = "0" "/>