If you run with safari, you will get this in startBroser:

EXCEPTION:org.openqa.selenium.WebDriverException: Unknown command: setTimeout (WARNING: The server did not provide any stacktrace information)
Command duration or timeout: 1 milliseconds
Build info: version: '2.43.1', revision: '5163bceef1bc36d43f3dc0b83c88998168a363a0', time: '2014-09-10 09:43:55'
System info: host: 'Marcio-Marchinis-MacBook-Pro-Silver.local', ip: '172.23.70.56', os.name: 'Mac OS X', os.arch: 'x86_64', os.version: '10.9.5', java.version: '1.7.0_67'
Session ID: null
Driver info: org.openqa.selenium.safari.SafariDriver
Capabilities [{platform=MAC, cssSelectorsEnabled=true, javascriptEnabled=true, secureSsl=true, browserName=safari, takesScreenshot=true, version=7.0.6}]
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) [rt.jar:1.7.0_67]
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57) [rt.jar:1.7.0_67]
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) [rt.jar:1.7.0_67]
at java.lang.reflect.Constructor.newInstance(Constructor.java:526) [rt.jar:1.7.0_67]
at org.openqa.selenium.remote.ErrorHandler.createThrowable(ErrorHandler.java:204) [selenium-remote-driver-2.43.1.jar]
at org.openqa.selenium.remote.ErrorHandler.throwIfResponseFailed(ErrorHandler.java:156) [selenium-remote-driver-2.43.1.jar]
at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:599) [selenium-remote-driver-2.43.1.jar]
at org.openqa.selenium.remote.RemoteWebDriver$RemoteWebDriverOptions$RemoteTimeouts.pageLoadTimeout(RemoteWebDriver.java:782) [selenium-remote-driver-2.43.1.jar]
at com.xebia.incubator.xebium.SeleniumDriverFixture.setTimeoutOnSelenium(SeleniumDriverFixture.java:262) [xebium-0.14-SNAPSHOT-mqm.jar]
at com.xebia.incubator.xebium.SeleniumDriverFixture.startDriverOnUrl(SeleniumDriverFixture.java:153) [xebium-0.14-SNAPSHOT-mqm.jar]
at com.xebia.incubator.xebium.SeleniumDriverFixture.startBrowserOnUrl(SeleniumDriverFixture.java:167) [xebium-0.14-SNAPSHOT-mqm.jar]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [rt.jar:1.7.0_67]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) [rt.jar:1.7.0_67]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) [rt.jar:1.7.0_67]
at java.lang.reflect.Method.invoke(Method.java:606) [rt.jar:1.7.0_67]
at fitnesse.slim.fixtureInteraction.DefaultInteraction.methodInvoke(DefaultInteraction.java:16) [fitnesse-standalone.jar]
at fitnesse.slim.MethodExecutor.callMethod(MethodExecutor.java:43) [fitnesse-standalone.jar]
at fitnesse.slim.MethodExecutor.invokeMethod(MethodExecutor.java:30) [fitnesse-standalone.jar]
at fitnesse.slim.MethodExecutor.findAndInvoke(MethodExecutor.java:52) [fitnesse-standalone.jar]
at fitnesse.slim.FixtureMethodExecutor.execute(FixtureMethodExecutor.java:20) [fitnesse-standalone.jar]
at fitnesse.slim.StatementExecutor.getMethodExecutionResult(StatementExecutor.java:121) [fitnesse-standalone.jar]
at fitnesse.slim.StatementExecutor.call(StatementExecutor.java:99) [fitnesse-standalone.jar]
at fitnesse.slim.instructions.CallInstruction.executeInternal(CallInstruction.java:35) [fitnesse-standalone.jar]
at fitnesse.slim.instructions.Instruction.execute(Instruction.java:30) [fitnesse-standalone.jar]
at fitnesse.slim.ListExecutor$Executive.executeStatement(ListExecutor.java:50) [fitnesse-standalone.jar]
at fitnesse.slim.ListExecutor$Executive.executeStatements(ListExecutor.java:44) [fitnesse-standalone.jar]
at fitnesse.slim.ListExecutor.execute(ListExecutor.java:84) [fitnesse-standalone.jar]
at fitnesse.slim.SlimServer.executeInstructions(SlimServer.java:107) [fitnesse-standalone.jar]
at fitnesse.slim.SlimServer.processTheInstructions(SlimServer.java:94) [fitnesse-standalone.jar]
at fitnesse.slim.SlimServer.processOneSetOfInstructions(SlimServer.java:68) [fitnesse-standalone.jar]
at fitnesse.slim.SlimServer.tryProcessInstructions(SlimServer.java:54) [fitnesse-standalone.jar]
at fitnesse.slim.SlimServer.serve(SlimServer.java:40) [fitnesse-standalone.jar]
at fitnesse.slim.SlimService.handle(SlimService.java:164) [fitnesse-standalone.jar]
at fitnesse.slim.SlimService.acceptOne(SlimService.java:172) [fitnesse-standalone.jar]
at fitnesse.slim.SlimService.accept(SlimService.java:134) [fitnesse-standalone.jar]
at fitnesse.slim.SlimService.startWithFactory(SlimService.java:65) [fitnesse-standalone.jar]
at fitnesse.slim.SlimService.main(SlimService.java:51) [fitnesse-standalone.jar]