Created attachment 718176 [details]
patch to fix the problem

Description of problem:

NSS_ShutdownContext fails with SEC_ERROR_BUSY - resources in use.  This is because there is still a reference to the cert db opened with SECMOD_OpenUserDB.

Apps must call PK11_FreeSlot to release the reference after calling SECMOD_CloseUserDB - then NSS_ShutdownContext will return success.

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