So friends we all know in terms of memory usage and leakage as well firefox sucks and make speed of system miserable, if we open multiple browser windows with multiple tabs in it . This does not means that you should simply run away from it , geeks in this world never let there minds locks and here they introduced solution to this.i just found a useful plugin which can help us to tame the memory usage of firefox , you can install this from here . Name of this wonderful plugin is memory fox . To let you install this plugin you need to enable check box which says let me install experimental plugins. To start installation you should create your account first , if you dont want to make yours , then send me a message i will give you mine .
To compare the performance of my computer system before and after using this plugin i first disable this plugin and analyze that if i open 4 tabs in one browser window then memory captured by firefox is 256 megabyte, but if we keep this open for one hour then memory usage goes upto 1 giga byte.This is simply unaccepatable. So i enable this plugin by tools->memory fox and then actiavte this from here. After this i prompted to restart my browser . And vollla !!!!!!!! just to test my veil i opened 20 tabs in a single browser . i expected memory usage in gbytes but plugin did its job pretty well in taming the firefox the overall memory usage was 40 mega bytes. i wondered and patted my back for finding such solution for such weird problem of mine, but engineer in my soul start weilding its sword for finding the miracle behind this magic and here comes the answer from the gekky lord 
the author himslf expalin on its website
Memory Fox focuses on two ( 2 ) types of memory usage and with flushing for memory recovery. When resource requirements ( Stack and Heap ) have been reached, according to the user’s preset option settings, the memory will be flushed and recovered from Fragmented Orphaned Ram memories.
So this made my doubts clear
if you have any doubt regarding this plugin please drop me a comment i would love to answer your queries
Please note plugin is only for WINXP and vista , it is not available for Linux .
