The releases made before Firefox 4.0 will improve Javascript handling performance, improved "form completion tools", pageload enhancements and more. This report however is currently classed only as a draft, and therefore it could change between now and the time that Firefox 4.0, or any of the in-between versions are released.
One thing that is expected with Firefox 4.0 however, is for every individual tab open in the browser window to have its own separate process, like they do in Google Chrome. This reduces the risks of losing a browser session when you have multiple tabs open.
Written by: James Delahunty @ 7 Sep 2009 19:40