Add an option to VariablesView's populate to hide the object's proto. With a use case like the Manifest Editor in App Manager, there is no need to present a prototype.
I think the onlyEnumVisible setter is what you want. Currently only the debugger uses it, so take a look there. Reopen if not useful.
Network monitor needs to use the same option as well. There is no use in displaying __proto__ for JSON objects.
(In reply to Panos Astithas [:past] from comment #2) > Network monitor needs to use the same option as well. There is no use in > displaying __proto__ for JSON objects. Bug 862344.