启动firefox报错如下：
rg.openqa.selenium.firefox.NotConnectedException: Unable to connect to host 127.0.0.1 on port 7055 after 45000 ms. Firefox console output:
ailure code: 0x8000ffff (NS_ERROR_UNEXPECTED) [nsINavBookmarksService.removeFolderChildren]
JavaScript error: jar:file:///D:/ztsoft/FireFox/browser/omni.ja!/components/nsBrowserGlue.js, line 1979: NS_ERROR_UNEXPECTED: Component returned failure code: 0x8000ffff (NS_ERROR_UNEXPECTED) [nsIAnnotationService.getItemsWithAnnotation]
1522425391255 addons.manager DEBUG Loaded provider scope for resource://gre/modules/addons/XPIProvider.jsm: ["XPIProvider"]
1522425391257 addons.manager DEBUG Loaded provider scope for resource://gre/modules/LightweightThemeManager.jsm: ["LightweightThemeManager"]
1522425391259 addons.manager DEBUG Loaded provider scope for resource://gre/modules/addons/GMPProvider.jsm
1522425391260 addons.manager DEBUG Loaded provider scope for resource://gre/modules/addons/PluginProvider.jsm
1522425391260 addons.manager DEBUG Starting provider: XPIProvider
1522425391261 addons.xpi DEBUG startup
此时的selenium版本为2.44版本，firefox为39。
配置selenium版本为2.52版本即可
参考博客下面博客得知版本对应关系：https://blog.csdn.net/fetch001/article/details/64437979
Selenium】 -> 【FireFox】
2.25.0 -> 18
2.30.0 -> 19
2.31.0 -> 20
2.42.2 -> 29
2.44.0 -> 33 (不支持31)
2.53.0 -> 43,46(不支持47)
2.41.0 -> 26(绿色版本)
2.44 -> 32.0-35.0
2.53.0-2.53.6 -> 40.0.3