This behavior is unacceptable. There is a timeout setting that allows this kind of crash to be postponed indefinitely, but that's not the desired behavior. After the timeout, Firefox asks if I want to allow the plugin to continue running or stop it. It has a check box labeled "Don't ask me again". I don't think this is correctly functioning, because the expected behavior when checking "Don't ask me again", would be for it to timeout and crash. The problem I have is that when I do NOT check "Don't ask me again", and click continue, I expect it to ask me again once the timeout period elapses, but instead of asking me again, it just crashes without asking me again. That does not seem right. I do not want to disable or extend the timeout. I am fine with it asking me every so often whether I want to allow the plugin to continue or stop it. But unless I check "don't ask me again", it should continue to ask me if I want to allow it to continue or stop it. It should NEVER just close abruptly, unless I check "don't ask me again". Related question: https://support.mozilla.org/en-US/questions/705051