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When the user leaves instance’s page which function is called?

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When the user leaves instance’s page which function is called?

(a) NPP_New

(b) NPP_Destroy

(c) NP_Shutdown

(d) NP_Initialize
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Correct answer is (b) NPP_Destroy

Easy explanation: When the user leaves instance’s page or closes its window a plug-in instance is deleted. Then Gecko calls the function NPP_Destroy to inform plug-in that the instance is being deleted. Plug-in API calls and callbacks use main Navigator thread.
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