Comment 72 for bug 940631

When starting multiple network actions in parallel, more than one might require access to the saved logins. And if the secure password store hasn't yet been unlocked with the master password, then each of those parallel actions might trigger a request to unlock it.

The only way to fix this reliably is to implement something smart at the code layer that brings up the master password prompt, which is in mozilla/security/manager.

That code would have to prevent the race, by detecting if the first prompt has already been opened, and all consecutive requests would have to be put on hold, as long as the first prompt is shown or retrying. After the prompt has been completed or canceled, all queued up requests to unlock must be signaled to continue.