my firefox nodes (i am running docker on ubuntu server) seem to hang (100% reproduces), as using custom docker builds as using official via docker pull (chrome nodes work well).
#docker run c6970094431e /usr/bin/firefox
(process:1): GLib-CRITICAL **: g_slice_set_config: assertion 'sys_page_size == 0' failed
Error: cannot open display: :99.0
18:47:35.677 INFO - Executing: [new session: Capabilities [{platform=ANY, javascriptEnabled=true, browserName=firefox, version=}]])
18:47:35.678 INFO - Creating a new session for Capabilities [{platform=ANY, javascriptEnabled=true, browserName=firefox, version=}]
18:48:20.901 WARN - Exception thrown
java.util.concurrent.ExecutionException: org.openqa.selenium.WebDriverException: java.lang.reflect.InvocationTargetException
Build info: version: '2.44.0', revision: '76d78cf', time: '2014-10-23 20:02:37'
System info: host: 'c9657e29a60a', ip: '172.17.0.34', os.name: 'Linux', os.arch: 'amd64', os.version: '3.13.0-32-generic', java.version: '1.7.0_65'
Driver info: driver.version: unknown
at java.util.concurrent.FutureTask.report(FutureTask.java:122)
at java.util.concurrent.FutureTask.get(FutureTask.java:188)
at org.openqa.selenium.remote.server.DefaultSession.execute(DefaultSession.java:175)
at org.openqa.selenium.remote.server.DefaultSession.<init>(DefaultSession.java:111)
at org.openqa.selenium.remote.server.DefaultSession.createSession(DefaultSession.java:88)
at org.openqa.selenium.remote.server.DefaultDriverSessions.newSession(DefaultDriverSessions.java:108)
at org.openqa.selenium.remote.server.handler.NewSession.handle(NewSession.java:57)
at org.openqa.selenium.remote.server.handler.NewSession.handle(NewSession.java:1)
at org.openqa.selenium.remote.server.rest.ResultConfig.handle(ResultConfig.java:112)
at org.openqa.selenium.remote.server.JsonHttpCommandHandler.handleRequest(JsonHttpCommandHandler.java:172)
at org.openqa.selenium.remote.server.DriverServlet.handleRequest(DriverServlet.java:201)
at org.openqa.selenium.remote.server.DriverServlet.doPost(DriverServlet.java:163)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
at org.openqa.selenium.remote.server.DriverServlet.service(DriverServlet.java:129)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
at org.openqa.jetty.jetty.servlet.ServletHolder.handle(ServletHolder.java:428)
at org.openqa.jetty.jetty.servlet.ServletHandler.dispatch(ServletHandler.java:680)
at org.openqa.jetty.jetty.servlet.ServletHandler.handle(ServletHandler.java:571)
at org.openqa.jetty.http.HttpContext.handle(HttpContext.java:1526)
at org.openqa.jetty.http.HttpContext.handle(HttpContext.java:1479)
at org.openqa.jetty.http.HttpServer.service(HttpServer.java:920)
at org.openqa.jetty.http.HttpConnection.service(HttpConnection.java:820)
at org.openqa.jetty.http.HttpConnection.handleNext(HttpConnection.java:986)
at org.openqa.jetty.http.HttpConnection.handle(HttpConnection.java:837)
at org.openqa.jetty.http.SocketListener.handleConnection(SocketListener.java:243)
at org.openqa.jetty.util.ThreadedServer.handle(ThreadedServer.java:358)
at org.openqa.jetty.util.ThreadPool$PoolThread.run(ThreadPool.java:537)
Caused by: org.openqa.selenium.WebDriverException: java.lang.reflect.InvocationTargetException
Build info: version: '2.44.0', revision: '76d78cf', time: '2014-10-23 20:02:37'
System info: host: 'c9657e29a60a', ip: '172.17.0.34', os.name: 'Linux', os.arch: 'amd64', os.version: '3.13.0-32-generic', java.version: '1.7.0_65'
Driver info: driver.version: unknown
at org.openqa.selenium.remote.server.DefaultDriverProvider.callConstructor(DefaultDriverProvider.java:69)
at org.openqa.selenium.remote.server.DefaultDriverProvider.newInstance(DefaultDriverProvider.java:53)
at org.openqa.selenium.remote.server.DefaultDriverFactory.newInstance(DefaultDriverFactory.java:54)
at org.openqa.selenium.remote.server.DefaultSession$BrowserCreator.call(DefaultSession.java:214)
at org.openqa.selenium.remote.server.DefaultSession$BrowserCreator.call(DefaultSession.java:1)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at org.openqa.selenium.remote.server.DefaultSession$1.run(DefaultSession.java:168)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
at org.openqa.selenium.remote.server.DefaultDriverProvider.callConstructor(DefaultDriverProvider.java:59)
... 9 more
Caused by: org.openqa.selenium.WebDriverException: Failed to connect to binary FirefoxBinary(/usr/bin/firefox) on port 7055; process output follows:
(process:734): GLib-CRITICAL **: g_slice_set_config: assertion 'sys_page_size == 0' failed
Xlib: extension "RANDR" missing on display ":99".
process 734: D-Bus library appears to be incorrectly set up; failed to read machine uuid: Failed to open "/etc/machine-id": No such file or directory
See the manual page for dbus-uuidgen to correct this issue.
Build info: version: '2.44.0', revision: '76d78cf', time: '2014-10-23 20:02:37'
System info: host: 'c9657e29a60a', ip: '172.17.0.34', os.name: 'Linux', os.arch: 'amd64', os.version: '3.13.0-32-generic', java.version: '1.7.0_65'
Driver info: driver.version: FirefoxDriver
at org.openqa.selenium.firefox.internal.NewProfileExtensionConnection.start(NewProfileExtensionConnection.java:134)
at org.openqa.selenium.firefox.FirefoxDriver.startClient(FirefoxDriver.java:246)
at org.openqa.selenium.remote.RemoteWebDriver.<init>(RemoteWebDriver.java:114)
at org.openqa.selenium.firefox.FirefoxDriver.<init>(FirefoxDriver.java:193)
at org.openqa.selenium.firefox.FirefoxDriver.<init>(FirefoxDriver.java:186)
at org.openqa.selenium.firefox.FirefoxDriver.<init>(FirefoxDriver.java:104)
... 14 more
Caused by: org.openqa.selenium.WebDriverException: java.lang.InterruptedException: Process timed out after waiting for 45000 ms.
Build info: version: '2.44.0', revision: '76d78cf', time: '2014-10-23 20:02:37'
System info: host: 'c9657e29a60a', ip: '172.17.0.34', os.name: 'Linux', os.arch: 'amd64', os.version: '3.13.0-32-generic', java.version: '1.7.0_65'
Driver info: driver.version: FirefoxDriver
at org.openqa.selenium.os.CommandLine.waitFor(CommandLine.java:131)
at org.openqa.selenium.firefox.FirefoxBinary.waitFor(FirefoxBinary.java:222)
at org.openqa.selenium.firefox.FirefoxBinary.clean(FirefoxBinary.java:242)
at org.openqa.selenium.firefox.internal.NewProfileExtensionConnection.start(NewProfileExtensionConnection.java:91)
... 19 more
Caused by: java.lang.InterruptedException: Process timed out after waiting for 45000 ms.
at org.openqa.selenium.os.UnixProcess.waitFor(UnixProcess.java:148)
at org.openqa.selenium.os.CommandLine.waitFor(CommandLine.java:129)
... 22 more
18:48:20.904 WARN - Exception: Process timed out after waiting for 45000 ms.