How to reduce memory usage in Firefox

For those Fire Fox users, you all must know that Fire Fox requires a lot memory to perform. Sometime you will realized that your computer is no enough memory to perform well once you opened many tabs!

How to reduce memory usage in Mozilla Firefox

1. Type about:config in the Firefox address bar
2. Search for browser.sessionhistory.max_entries
3. Double click on the value 50, change it to something lower, 5 should be good.

Explanations

Averagely we surf less than 5 of the websites we previously surfed before, there is no need to usage up that much memory (which is 50 by default)