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Introduce a gecko live region changed event and fire it from within content. This way it gets coalesced in the case of many insertions/deletions. Also, rely on text insert/delete instead of reorder because there can be cases where the text in a leaf changes as opposed to a tree mutation. We get text insert/delete on mutations too, so that should cover it. Differential Revision: https://phabricator.services.mozilla.com/D224388