Ok, don’t waste a time. Let’s check this out. I just found these cool tips. Good stuff for Firefox user. All you need to do is:-
1. Open you Firefox browser and at the address bar type about:config and press ENTER
2. Right click and select new > boolean
3. On the popup box, type config.trim_on_minimize and press ENTER
4. Next, select True and press ENTER
5. Restart your Firefox
Open your windows task manager and see your Firefox’s memory usage. Anything difference? So, next time, no need to worry about you Firefox’s memory usage anymore.