After having to hunt in google chrome dev tools for memory leaks from a single page JavaScript app, memory dumps with a separate tool that can give you a really good insight into what hanging around would be great. I found that if you were doing snapshots of website states and the memory footprint was significant then the browser just wasnt able to handle displaying all of them at once. I know this is an issue kinda for chrome, but I figure Firefox might have a similar problem. And single page/MVC javascript apps are only going to get more demanding.