Reduce RAM usage to 10MB when Firefox is minimized:
This little hack will drop Firefox’s RAM usage down to 10 Mb when minimized:
1. Open Firefox and go to the Address Bar. Type in about:config and then press Enter.
2. Right Click in the page and select New -> Boolean.
3. In the box that pops up enter “config.trim_on_minimizeâ€. Press Enter.
4. Now select True and then press Enter.
5. Restart Firefox.
Reduce the amount of RAM Firefox uses for its cache feature
1. Type “about:config†(no quotes) in the adress bar in the browser.
2. Find “browser.sessionhistory.max_total_viewerâ€
3. Set it’s value to “0“;(Zero)
www.dagorret.net/2009/03/25/a-handful-of-firefox-tweaks-that-will-double-your-browser-speed