我只需要使用jdk 1.6.0_45来运行selenium测试。我一直在使用firefox 49.0和selenium-standalone-sever 2.43.1.jar。但我不断收到以下错误：
Unable to connect to host 127.0.0.1 on port 7055 after 45000 ms. Firefox console output:
}},"app-system-defaults":{"firefox@getpocket.com":
{"d":"/usr/lib/firefox/browser/features/firefox@getpocket.com.xpi","e":true,"v":"1.0.4","st":1474361173000},"webcompat@mozilla.org":{"d":"/usr/lib/firefox/browser/features/webcompat@mozilla.org.xpi","e":true,"v":"1.0","st":1474361173000},"e10srollout@mozilla.org":{"d":"/usr/lib/firefox/browser/features/e10srollout@mozilla.org.xpi","e":true,"v":"1.2","st":1474361172000}},"app-global":{"{972ce4c6-7e08-4474-a285-3208198ce6fd}":{"d":"/usr/lib/firefox/browser/extensions/{972ce4c6-7e08-4474-a285-3208198ce6fd}.xpi","e":true,"v":"49.0","st":1474361172000}},"app-system-share":{"ubufox@ubuntu.com":{"d":"/usr/share/mozilla/extensions/{ec8030f7-c20a-464f-9b0e-13a3a9e97384}/ubufox@ubuntu.com.xpi","e":false,"v":"3.2","st":1442597402000}}}
1476448669049 addons.xpi DEBUG No changes found
1476448669059 addons.xpi DEBUG Registering manifest for /usr/lib/firefox/browser/features/firefox@getpocket.com.xpi
1476448669060 addons.xpi DEBUG Loading bootstrap scope from /usr/lib/firefox/browser/features/firefox@getpocket.com.xpi
1476448669075 addons.xpi DEBUG Calling bootstrap method startup on firefox@getpocket.com version 1.0.4
1476448669082 addons.xpi-utils DEBUG Starting async load of XPI database /tmp/anonymous8478643584785783937webdriver-profile/extensions.json
1476448669083 addons.xpi DEBUG Registering manifest for /usr/lib/firefox/browser/features/webcompat@mozilla.org.xpi
1476448669084 addons.xpi DEBUG Loading bootstrap scope from /usr/lib/firefox/browser/features/webcompat@mozilla.org.xpi
1476448669086 addons.xpi DEBUG Calling bootstrap method startup on webcompat@mozilla.org version 1.0
1476448669086 addons.xpi DEBUG Registering manifest for /usr/lib/firefox/browser/features/e10srollout@mozilla.org.xpi
1476448669086 addons.xpi DEBUG Loading bootstrap scope from /usr/lib/firefox/browser/features/e10srollout@mozilla.org.xpi
1476448669089 addons.xpi DEBUG Calling bootstrap method startup on e10srollout@mozilla.org version 1.2
1476448669094 addons.manager DEBUG Registering shutdown blocker for XPIProvider
1476448669095 addons.manager DEBUG Provider finished startup: XPIProvider
1476448669095 addons.manager DEBUG Starting provider: LightweightThemeManager
1476448669095 addons.manager DEBUG Registering shutdown blocker for LightweightThemeManager
1476448669095 addons.manager DEBUG Provider finished startup: LightweightThemeManager
1476448669096 addons.manager DEBUG Starting provider: GMPProvider
1476448669104 addons.manager DEBUG Registering shutdown blocker for GMPProvider
1476448669104 addons.manager DEBUG Provider finished startup: GMPProvider
1476448669105 addons.manager DEBUG Starting provider: PluginProvider
1476448669105 addons.manager DEBUG Registering shutdown blocker for PluginProvider
1476448669107 addons.manager DEBUG Provider finished startup: PluginProvider
1476448669109 addons.manager DEBUG Completed startup sequence
1476448669375 addons.xpi-utils DEBUG Async JSON file read took 0 MS
1476448669376 addons.xpi-utils DEBUG Finished async read of XPI database, parsing...
1476448669378 addons.xpi-utils DEBUG Successfully read XPI database
1476448669390 addons.manager DEBUG Starting provider: <unnamed-provider>
1476448669390 addons.manager DEBUG Registering shutdown blocker for <unnamed-provider>
1476448669391 addons.manager DEBUG Provider finished startup: <unnamed-provider>
*** Blocklist::_loadBlocklistFromFile: blocklist is disabled
1476448669531 addons.manager DEBUG Starting provider: PreviousExperimentProvider
1476448669531 addons.manager DEBUG Registering shutdown blocker for PreviousExperimentProvider
1476448669532 addons.manager DEBUG Provider finished startup: PreviousExperimentProvider
JavaScript error: file:///tmp/anonymous8478643584785783937webdriver-profile/extensions/fxdriver@googlecode.com/components/driver-component.js, line 11464: TypeError: this.server_ is undefined
JavaScript error: chrome://fxdriver/content/server.js, line 38: NS_ERROR_XPC_CI_RETURNED_FAILURE: Component returned failure code: 0x80570015 (NS_ERROR_XPC_CI_RETURNED_FAILURE) [nsIJSCID.createInstance]
我也尝试过以下罐子，但它仍然不起作用：
selenium server-standalone-3.0.0-beta4.jar
有任何建议吗？