nsDirectoryService is not threadsafe even though it uses threadsafe AddRef/Release. It accesses a hash table and JS components from whatever thread it is called on, and none of that is safe.
It probably had threadsafe AddRef/Release for use with XPCOM proxies. We should kill that.
Yeah, we should refuse to make directory service *usable* on other threads with assertions. I'm not sure I care as much about the refcounting if there's code actually using some kind of hand-rolled proxy, although that really shouldn't be necessary.
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