Created attachment 549458 [details] [diff] [review]
nsNPAPIPluginInstance::Start is called in the [Try]SetUpPluginInstance code paths but we call it again if that succeeds. The second time it just bails at the start because the plugin is already started. There is one legitimate use case, or at least a case in which we can't simply remove the call, so that has been left.
pushed to mozilla-central