I don't see an obvious reason for this to be happening; we never seem to get the expando object's parent.

Comment on attachment 8568932 [details] [diff] [review] Stop parenting Xray expando objects to a non-global Review of attachment 8568932 [details] [diff] [review]: ----------------------------------------------------------------- I think this may have been used before we switched xray expandos to a C++ WeakMap, but now it does indeed appear unused. Huzzah! ::: js/xpconnect/wrappers/XrayWrapper.cpp @@ +941,5 @@ > JS_ClearPendingException(cx); > } > #endif > > // Create the expando object. We parent it directly to the target object. Comment needs updating.

Comment updated, good catch.