It appears that the code which creates JS sandboxes [1] doesn't explicitly call JS_SetVersion (nor does the context callback for xpconnect [2]), and it further doesn't provide any mechanism for JS code to set the version. As a result, it appears that all sandboxes created in Firefox don't accept JS 1.7 code (namely, use of 'let' and 'yield' statements raise syntax errors). Note that sandboxes crea
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