Thanks for the tutorial. There are a few things that may be worth pointing out about using this setting.

First. if you don't wish to edit about.config you can create a file called user.js and place it in your firefox profiles directory. edit the file an enter the following line:

user_pref("config.trim_on_minimize", true);

Save the file and restart firefox. Essentially any configuration changes you want to make to aboout.config can be made by entering the appropriate setting in user.js.

Second. making this change does not actually reduce the amount of memory fx uses, it just swaps memory from RAM to disk. From the Mozillazine KB:

The config.trim_on_minimize setting (Windows only) does not reduce the amount of memory used, it just swaps memory from RAM to disk. This may make Firefox slow to "wake up". If config.trim_on_minimize is left set at the default value (false), the memory will be swapped to disk only if it is needed by another application. Therefore, for most purposes the default value is recommended.

There are also other settings which also play an important part in controlling fx memory, please look at:

Code:

browser.cache.memory.capacity
browser.cache.memory.enable
browser.sessionhistory.max_total_viewers

Finally you may also want to look at the Ramback utility:

https://addons.mozilla.org/en-US/firefox/addon/5972

Hope this helps.

Since version 3 of firefox, it has had similar technology to free up memory used by the program so Ramback isnt necessary. Note also that that addon is 3 years old.

swarfega said:

Since version 3 of firefox, it has had similar technology to free up memory used by the program so Ramback isnt necessary. Note also that that addon is 3 years old.

Agreed, I only made reference to Ramback for completeness. The Add-0n is still compatible:

Works with:

• Firefox: 3.0a8pre – 3.6a1pre

One other thing that I should have mentioned in my previous post is that the config.trim 'hack' actually hasn't worked since firefox 3 was released. There are numerous posts regarding this on the Mozilla forums, here's an example:

How do I (Firefox 2 behavior in Firefox 3) • mozillaZine Forums

4-5 mb? realy need?
whithoyt this - 12mb! del this script

Are there any other about:config tweaks anybody would recommend to speed firefox up?

i have a similar prob...i remeber using some feature in my windows 7 which had the option like
i paid for my RAM, make full use
conserve ram or use less ram(something like that)
The first option was default selected i applied the second one.......ever since my desktop gadgets and object dock have started to lag and when i use firefox(esp when i start FB games)... the screen flashes and aero dissappears ....it comes back as soon as firefox is shut