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Enumerable cross-origin properties don't seem to be web-compatible #3183
Updating Firefox to #2777 caused a web compat issue: if a cross-origin window makes its way into jQuery.extend, that function will go into an infinite loop. This is turning up as a problem on actual sites. See https://bugzilla.mozilla.org/show_bug.cgi?id=1412741 for details.
I will be backing out the corresponding changes from Firefox.
referenced this issue
Oct 31, 2017
No, because the recursive step in
The problem would occur with an object graph that contains plain objects, has loops, and has non-writable properties so the loops don't get broken by