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often 20% to 30% less, and sometimes as much as 50% less

"Firefox 7 uses less memory than Firefox 6 (and 5 and 4)

This means that Firefox 7 is faster (sometimes drastically so) and less likely to crash, particularly if you have many websites open at once and/or keep Firefox running for a long time between restarts

Firefox has long been criticized for using large amounts of RAM

for not releasing memory when tabs are closed

practices that can degrade the browser's performance

extreme cases

crash or lock up

Mozilla has tried to stop the leaks before

If Mozilla maintains its rapid-release schedule, which results in a new edition every six weeks, the final version of Firefox 7 will ship Sept. 27

There are more than a thousand changes under the hood of the latest version of Firefox.

Google's Chrome web browser isn't much better - already reaching version 10

Ancient browser Microsoft Interner Explorer has only recently  staggered to version 9

Firefox 6 isn’t a minor upgrade

only a few of these changes provide worthwhile reasons for upgrading to the newest release of the browser.

Firefox 6 speed increases The first reason to upgrade to Firefox 6 is speed, although that point is debatable.