It looks like this support was added in bug 78622 as part of the "#ifdef IMPLEMENT_SYNC_LOAD" codepath. That codepath was subsequently removed, but the weakref support stayed.
Attachment #8968972 - Flags: review?(kyle)
Attachment #8968972 - Flags: review?(kyle) → review+
Pushed by firstname.lastname@example.org: https://hg.mozilla.org/integration/mozilla-inbound/rev/54cd958c5398 Remove support for weak references from DOMParser. r=qdot
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