To my delight, I found that Firefox uses considerably less memory after prolonged use than its predecessor, Firefox 3.5.6. Better memory use may not strike you as the most exciting thing about a Web browser, but if you're a serious Web user, with multiple tabs open at once for hours at a time, it's a big deal. I, and other users, have noticed memory issues with Firefox 3.5.6 that slowed a PC's overall performance. In my testing of 3.6, these memory problems appear to have been fixed, and that alone makes it a "must upgrade" in my book.
I also noticed that the new Firefox is much faster than the last version. Part of this speed boost comes from Firefox's new ability to run scripts asynchronously. In the past, Firefox waited for the first script on the page to download completely before running the next script, no matter how long it took to download. Now, Firefox runs whichever script downloads first, no matter where it's placed on the page. It's one of those small changes that make a big practical difference on pages with multiple scripts
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Note: This information is taken from other site.
I also noticed that the new Firefox is much faster than the last version. Part of this speed boost comes from Firefox's new ability to run scripts asynchronously. In the past, Firefox waited for the first script on the page to download completely before running the next script, no matter how long it took to download. Now, Firefox runs whichever script downloads first, no matter where it's placed on the page. It's one of those small changes that make a big practical difference on pages with multiple scripts
.Click Here to Download
Note: This information is taken from other site.