Goals for multi-process firefox
“Since the release of Firefox 4 we’ve been working again to bring multi-process content support to Firefox. I thought that it would be good to write a post to try to lay out some of the reasons why we’re doing this. Although it might be obvious to many people, it’s good to actually lay it out on paper so that we have a clear understanding of why we’re doing something. It helps us determine what to prioritize as well as helps us measure when we’re ready to ship….”
Source: Blog Mozilla
More http://blog.mozilla.com/products/2011/07/15/goals-for-multi-process-firefox/