Mozilla Firefox is widely being used today. But some people prefer Internet Explorer more than Mozilla Firefox because Mozilla Firefox consume a lot of memory and sometimes does not respond. Did you notice that Mozilla Firefox consumes a lot of memory over a period of time and sometimes slows down your surfing experience. Don’t worry, there is a solution for you. Reducing Memory Usage In Mozilla Firefox Type about:config in the Firefox address bar Search for browser.sessionhistory.max_entries Double click on the value 50, change it to something lower, 5 should be good. On an average we surf less than 5 of the websites we previously surfed before, there is no need to use up that much memory (which is 50 by default) Release Memory When Firefox Minimized Sometimes, user installs a lot of themes, plug-ins, and extensions which will cause their Firefox consume a lot of memory. It is highly recommend that user uninstall unnecessary themes and plug-ins in order to reduce the memory usage. Normally firefox will take around 80MB of memory after you open a few tabs. But after you "realeased the memory", it only take around 20-30MB. Steps: Launch Mozilla Firefox Key in about:config in the address bar. Right click at the content (anywhere) and choose New->Boolean. In the textbox, type config.trim_on_minimize and press OK. Set the value to true, and press OK. Restart firefox to take effect.