The best time to hide SpiderMonkey language extensions from web content is in the Firefox release immediately following an ESR.
Bug 1083498 has already removed it from Firefox 40. Marking dup. https://www.fxsitecompat.com/en-US/docs/2015/destructuring-for-in-loop-has-been-removed/
Status: NEW → RESOLVED
Last Resolved: 3 years ago
Resolution: --- → DUPLICATE
Duplicate of bug: 1083498
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