Here's an excerpt from debugger.properties:
# LOCALIZATION NOTE (localScope): The label that is displayed in the variables
# pane as a header on the container for identifiers in a with block.
As an obvious paste result, the L10n note says that it's about localScope. Tools that rely on L10n comments may show that comment when edidint localScope instead of withScope.
I've fixed this in the patch in bug 723563.
Great, close this bug when you commit that patch. :)
The fix has now landed.