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On Windows operating systems, when a program is minimized and left
for a period of time, Windows will reclaim the memory the program used
in anticipation that other programs might need it. Because of the way
Mozilla applications are stored in memory, Windows is much more
aggressive in reclaiming the memory they use, which can cause a delay
when the program is restored. This preference determines whether to
allow Windows to reclaim memory from a minimized Mozilla application.
If
you set that to True in Firefox 1.5 (it may be in earlier builds, I
know it is in 1.5.0.1 for sure), it will tag memory it uses as
'flushable' on minimize for Windows. It can/will make it a little more
laggy when you unminimize the process but it is great for having a lot
of browser windows open and then launching a memory hungry app like
Quake 4.
For instance, unminimized, FF was using 50MB as an
example, and minimized it was using about 2MB of RAM. I don't know how
well that 'scales' yet but it is a nice feature if you tend to leave a
bunch of browsers open in the background.
Note: It isn't there
by default as a toggle option. Easy way to put it there is to open up a
"about:config" window, right click within the window, and select "New
Boolean" and then enter in "config.trim_on_minimize" and set it to
'True'.
You could also stick it in your profile preferences, but this way is the easiest to describe.
Edit:
It seems to make a big difference. One Firefox session had around 600MB
of memory use drop to 20MB when minimized. It also seems to work for
Thunderbird, which is nice because my RSS threads have been bloating
the memory footprint and I typically leave that minimized anyway.
On Windows operating systems, when a program is minimized and left
for a period of time, Windows will reclaim the memory the program used
in anticipation that other programs might need it.
if want fixing this memory setting for your PC RAM, follow this content :
- First open your "WINDOWS TASK MANAGER " with " ctrl+alt+del" ...
- Pres the "PROCESSES "
- Show the firefox.exe "CPU USAGE"
- Open a new mozilla firefox page
- Write the this " about:config " in the address bar. That will show your preferences of your firefox.
- Find this value : " accessibility.accesskeycausesactivation "
- " accessibility.accesskeycausesactivation " press the right click, than "new" , than "boolean".
- and write this : " config.trim_on_minimize "
- than press the " true " value
- close
all firefox windows and open a new firefox windows...open your "WINDOWS
TASK MANAGER " with " ctrl+alt+del".Show the firefox.exe "CPU USAGE"
again.
 - than minimize your firefox window.look again your task manager.firefox.exe's usage will change.
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Firefox Memory Setting 
