错误提示：

org.openqa.selenium.firefox.NotConnectedException: Unable to connect to host 127.0.0.1 on port 7055 after 45000 ms. Firefox console output:
mise.jsm -> resource://gre/modules/Promise-backend.js:747:1

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A coding exception was thrown and uncaught in a Task.

Full message: TypeError: aAddon._installLocation is undefined

错误原因：

FireFox的版本有不匹配，可以将Firefox的版本换成V41.0.0.5738，或者其他可用的版本

错误截图：