That is a different issue and not related to PlaySound API, library. Should be an easy fix, because it is an assertion that prevents the init from calling in content. https://hg.mozilla.org/mozilla-central/annotate/3dc7d345da5282969b71079d483ff8c30558819d/widget/nsSoundProxy.cpp#l45 Could you please file another one?
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That is a different issue and not related to PlaySound API, library. Should be an easy fix, because it is an assertion that prevents the init from calling in content. https://hg.mozilla.org/mozilla-central/annotate/3dc7d345da5282969b71079d483ff8c30558819d/widget/nsSoundProxy.cpp#l45 Could you please file another bug about that?