selenium IDE 无法新建new test case

[QJN0602]

请大神们尽快帮我解决，刚入门就遇见问题，多谢！
新建new test case 无效，无法录制
There was an unexpected error. Msg: TypeError: window.editor.infoPanel is undefined
Url: chrome://selenium-ide/content/selenium-ide.xul, line: 1, column: 1
onclick@chrome://selenium-ide/content/selenium-ide.xul:1:1

Version:
Selenium IDE 2.9.1
Firefox 56.0.2(32位)
PC Windows 10 企业版
System Type 64 bit