Created attachment 8846400 [details] Screen Shot 2017-03-12 at 7.30.50 AM.png Attached is a screenshot showing the same error message in Firefox 54 and (in the background) Chrome 56. The Chrome error is vastly more helpful.
I suspect the JS team would need to improve this type of message.
Product: Firefox → Core
we're throwing from ToObjectSlow, with ReportIsNullOrUndefined. maybe we could pass more context to ToObject* functions.
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