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We already have a mechanism for ending threads accepting new messages when they are shut down, so this only allows tasks started from thread shutdown tasks during xpcom shutdown to behave consistently. We already didn't prevent dispatching to the background thread pool at this time, so it should make little difference there as well, and may just instead save us from deadlocks where code expects a dispatch to succeed and it does not during actor shutdown. This patch both relaxes the check to only be a NS_ASSERTION, and relaxes it to allow dispatching to the current thread even after xpcom-shutdown-threads as that thread is definitely still alive. Differential Revision: https://phabricator.services.mozilla.com/D144592
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