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Chrome has had that for at least 2 years now. Sure, Firefox has some additions, but how is Firefox doing some breakthrough?

https://developer.chrome.com/devtools/docs/javascript-memory...

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I wish you'd asked it like this:

Chrome has had memory profiling for at least 2 years. https://developer.chrome.com/devtools/docs/javascript-memory...

How does Firefox's new profiling feature compare?

Chrome's tool supports a dominator tree view. Sorry, also I'm excited to see a memory usage tool for firefox is now available. Supporting a dominator tree view is IMHO a crucial feature you will need sooner or later for investigating memory usage issues. The predecessor to the Eclipse Memory Analyzer had that in 2006/2007.

The dominator tree view[0] is one of the first things being worked on after release.

[0] https://bugzilla.mozilla.org/show_bug.cgi?id=1149367

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