HackTrick

1.Minimize Hack

The first hack that I have here is the popular Firefox Minimize Hack that has recently flashed through the internet. The purpose of this hack tries to keep Firefox from eating up your physical RAM and instead puts the burden on your hard drive, or at least that is the general reason behind it. To implement this hack, perform the following steps.
1. With Firefox up and running, type about:config and hit enter.
2. Right click on the new page and select New -> Boolean.
3. In the pop-up window, type in “config.trim_on_minimize” without quotes and hit enter.
4. In the next pop-up window, select True and hit enter.
5. Restart your browser

Result:With that done, open up a bunch of tabs and monitor the memory usage. In my first run without this hack, Firefox was using 137.8 Mb of Ram. With all 30 tabs open again, Firefox was using 118.4 Mb, but when minimized this dropped to an astounding 4 Mb. However, this was too good to be true, I left Firefox minimized and came back 12 minutes later and the memory use had slowly creeped up to 42.4 Mb. While this was 10 times larger than the initial 4.2 Mb, I was still saving about 75 Mb.