That's with 3.0.2 build 6. Error still present. Looks like nspluginwrapper issue to me since without the wrapper videos display fine. (Sorry it's ASSIGNED, I can't switch it back to NEW).

*** NSPlugin Viewer  *** ERROR: could not reconstruct XVisual from visualID
*** NSPlugin Viewer  *** ERROR: could not reconstruct XVisual from visualID
*** NSPlugin Viewer  *** ERROR: NPN_InvalidateRect() invoke: Message type invalid
*** NSPlugin Wrapper *** ERROR: NPP_WriteReady() invoke: Message type invalid
*** NSPlugin Wrapper *** ERROR: NPP_Write() invoke: Message type invalid
*** NSPlugin Wrapper *** ERROR: NPP_DestroyStream() invoke: Message type invalid

(firefox-bin:5506): GLib-CRITICAL **: g_hash_table_remove_internal: assertion `hash_table != NULL' failed
*** NSPlugin Wrapper *** ERROR: NPP_URLNotify() invoke: Połączenie zerwane przez drugą stronę
*** NSPlugin Wrapper *** ERROR: NPP_SetWindow() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_SetWindow() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_SetWindow() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_SetWindow() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_SetWindow() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_SetWindow() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_SetWindow() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_SetWindow() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_SetWindow() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_SetWindow() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_SetWindow() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_SetWindow() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_SetWindow() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_SetWindow() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_SetWindow() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_SetWindow() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_SetWindow() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_SetWindow() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_SetWindow() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_SetWindow() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_SetWindow() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_SetWindow() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_SetWindow() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_SetWindow() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_SetWindow() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_SetWindow() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_SetWindow() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_SetWindow() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_SetWindow() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_SetWindow() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_SetWindow() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_SetWindow() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_GetValue() invoke: Connection closed
*** NSPlugin Wrapper *** WARNING: unhandled variable 11 in NPP_GetValue()
*** NSPlugin Wrapper *** ERROR: NPP_SetWindow() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_GetValue() invoke: Connection closed
*** NSPlugin Wrapper *** WARNING: unhandled variable 11 in NPP_GetValue()
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_SetWindow() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_SetWindow() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_HandleEvent() invoke: Connection closed
*** NSPlugin Wrapper *** ERROR: NPP_Destroy() invoke: Connection closed