From your screenshot, there are a lot of instances of "objects > Array", "objects > Object", etc. Is the a way to display the variable name used for those objects?
Also, what is the plan for making tools like the Memory view appear in a default install? In other words, without having to go to the Settings. I worry that users may not know to click on the Settings and just think that other browsers offer more tools than we do.
Dominator trees give you fine-grained insight into memory retention.
In a graph rooted by some node R, a node A is said to dominate B iff every path to B starting from R passes through A. In the context of a heap graph, another way to say this would be that A is retaining B: if the garbage collector found A to be unreachable and eligible for reclaiming, than B would also be unreachable and eligible for reclaiming.
We also use this to calculate the "true" memory cost of a node in the heap graph. This is the "retained size" and contrasts with the naive "shallow size". For example, imagine a large binary tree where there are no outside references into subtrees, only to the root. The root node itself has a small shallow size: a left branch pointer, a value, and a right branch pointer. However, it is retaining the whole rest of this large tree's structure, and so its retained size is significant.
Here is a screenshot of the dominator tree (combined with allocation stack tracking) in action to debug the memory overhead of loading large source files in a CodeMirror editor: http://i.imgur.com/sGsVJb9.png