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+# Memory Tools
+
+The Memory tool lets you take a snapshot of the current tab's memory
+[heap](https://en.wikipedia.org/wiki/Memory_management#HEAP).
+It then provides a number of views of the heap that can
+show you which objects account for memory usage and exactly where in
+your code you are allocating memory.
+
+<iframe width="595" height="325" src="https://www.youtube.com/embed/DJLoq5E5ww0" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture"></iframe>
+
+------------------------------------------------------------------------
+
+## The basics
+-   Opening [the memory
+    tool](basic_operations.html#opening-the-memory-tool)
+-   [Taking a heap
+    snapshot](basic_operations.html#saving-and-loading-snapshots)
+-   [Comparing two
+    snapshots](basic_operations.html#comparing-snapshots)
+-   [Deleting
+    snapshots](basic_operations.html#clearing-a-snapshot)
+-   [Saving and loading
+    snapshots](basic_operations.html#saving-and-loading-snapshots)
+-   [Recording call
+    stacks](basic_operations.html#recording-call-stacks)
+
+------------------------------------------------------------------------
+
+## Analyzing snapshots
+
+The Tree map view is new in Firefox 48, and the Dominators view is new
+in Firefox 46.
+
+Once you've taken a snapshot, there are three main views the Memory
+tool provides:
+
+-   [the Tree map view](tree_map_view.md) shows
+    memory usage as a
+    [treemap](https://en.wikipedia.org/wiki/Treemapping).
+-   [the Aggregate view](aggregate_view.md) shows
+    memory usage as a table of allocated types.
+-   [the Dominators view](dominators_view.md)
+    shows the "retained size" of objects: that is, the size of objects
+    plus the size of other objects that they keep alive through
+    references.
+
+If you've opted to record allocation stacks for the snapshot, the
+Aggregate and Dominators views can show you exactly where in your code
+allocations are happening.
+
+------------------------------------------------------------------------
+
+## Concepts
+
+-   What are [Dominators](dominators.md)?
+
+------------------------------------------------------------------------
+
+## Example pages
+
+Examples used in the Memory tool documentation.
+
+-   The [Monster example](monster_example.md)
+-   The [DOM allocation example](DOM_allocation_example.md)