FirefoxProfile profile = new FirefoxProfile();
// customize your profile here...

DesiredCapabilities caps = DesiredCapabilities.Firefox();
caps.SetCapability("firefox_profile", profile.ToBase64String());

IWebDriver driver = new RemoteWebDriver(caps);
	
public void setup()
    final FirefoxProfile fp = new FirefoxProfile(new File("C:\temp\Firefox Profile"));        
    final DesiredCapabilities capability = DesiredCapabilities.firefox();
    capability.setCapability(FirefoxDriver.PROFILE, fp);
    driver = new RemoteWebDriver(new URL("http://127.0.0.1:5556/wd/hub"), capability);
}
	
org.openqa.selenium.WebDriverException: java.lang.reflect.InvocationTargetException
System info: os.name: 'Windows 7', os.arch: 'x86', os.version: '6.1', java.version: '1.6.0_19'
Driver info: driver.version: RemoteWebDriver
    at org.openqa.selenium.remote.BeanToJsonConverter.convertObject(BeanToJsonConverter.java:194)
    at org.openqa.selenium.remote.BeanToJsonConverter.convertObject(BeanToJsonConverter.java:141)
    at org.openqa.selenium.remote.BeanToJsonConverter.convertObject(BeanToJsonConverter.java:174)
    at org.openqa.selenium.remote.BeanToJsonConverter.convertObject(BeanToJsonConverter.java:141)
    at org.openqa.selenium.remote.BeanToJsonConverter.convert(BeanToJsonConverter.java:61)
    at org.openqa.selenium.remote.HttpCommandExecutor.execute(HttpCommandExecutor.java:247)
    at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:389)
    at org.openqa.selenium.remote.RemoteWebDriver.startSession(RemoteWebDriver.java:103)
    at org.openqa.selenium.remote.RemoteWebDriver.<init>(RemoteWebDriver.java:86)
    at org.openqa.selenium.remote.RemoteWebDriver.<init>(RemoteWebDriver.java:94)
    at samples.prototypeTest.setup(prototypeTest.java:67)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
    at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:27)
    at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:76)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:46)
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
Caused by: java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.openqa.selenium.remote.BeanToJsonConverter.convertObject(BeanToJsonConverter.java:188)
    ... 33 more
Caused by: java.lang.OutOfMemoryError: Java heap space
    at java.util.Arrays.copyOf(Arrays.java:2882)
    at java.lang.AbstractStringBuilder.expandCapacity(AbstractStringBuilder.java:100)
    at java.lang.AbstractStringBuilder.append(AbstractStringBuilder.java:572)
    at java.lang.StringBuffer.append(StringBuffer.java:320)
    at org.openqa.selenium.internal.Base64Encoder.encode(Base64Encoder.java:67)
    at org.openqa.selenium.io.Zip.zip(Zip.java:42)
    at org.openqa.selenium.firefox.FirefoxProfile.toJson(FirefoxProfile.java:477)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.openqa.selenium.remote.BeanToJsonConverter.convertObject(BeanToJsonConverter.java:188)
    at org.openqa.selenium.remote.BeanToJsonConverter.convertObject(BeanToJsonConverter.java:141)
    at org.openqa.selenium.remote.BeanToJsonConverter.convertObject(BeanToJsonConverter.java:174)
    at org.openqa.selenium.remote.BeanToJsonConverter.convertObject(BeanToJsonConverter.java:141)
    at org.openqa.selenium.remote.BeanToJsonConverter.convert(BeanToJsonConverter.java:61)
    at org.openqa.selenium.remote.HttpCommandExecutor.execute(HttpCommandExecutor.java:247)
    at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:389)
    at org.openqa.selenium.remote.RemoteWebDriver.startSession(RemoteWebDriver.java:103)
    at org.openqa.selenium.remote.RemoteWebDriver.<init>(RemoteWebDriver.java:86)
    at org.openqa.selenium.remote.RemoteWebDriver.<init>(RemoteWebDriver.java:94)
    at samples.prototypeTest.setup(prototypeTest.java:67)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
    at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:27)
    at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:76)

java.lang.NullPointerException
    at samples.prototypeTest.tearDown(prototypeTest.java:77)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
    at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:37)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:76)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:46)
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)