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These changes make our implementation of the enumeration hook for globals [match Gecko's](https://searchfox.org/mozilla-central/rev/1f65969e57c757146e3e548614b49d3a4168eeb8/dom/base/nsGlobalWindowInner.cpp#3297), fixing an assertion failure that occurred in the previous implementation. Our enumeration hook is supposed to fill a vector with names of properties on the global object without modifying the global in any way; instead we were defining all of the missing webidl interfaces. We now do much less work and crash less. Testing: New crashtest based on manual testcase. Fixes: #34686 --------- Signed-off-by: Josh Matthews <josh@joshmatthews.net>