title: Selenium WebDriver does not connect with Firefox 20
body: <p>I'm using selenium-server-standalone-2.28.0.jar .
  Launched the hub and
  Launched the listener using the following command</p>
  
  <pre><code>"C:\Program Files (x86)\Java\jre7\bin\Java.exe" -jar selenium-server-standalone-2.28.0.jar -role webdriver -hub http://localhost:4444/grid/register -port 5557 -browser "browserName=firefox",maxInstances=5,platform=WINDOWS,javaScriptEnabled=true,TAKES_SCREENSHOT=true
  </code></pre>
  
  <p>A blank Firefox window is opened and then following error is displayed:</p>
  
  <pre><code>Execute
  System.InvalidOperationException: Unable to connect to host 127.0.0.1 on port 7055 after 45000 ms. Firefox console output:
  *** LOG addons.manager: Application has been upgraded
  *** LOG addons.xpi: startup
  *** LOG addons.xpi: Skipping unavailable install location app-system-local
  *** LOG addons.xpi: Skipping unavailable install location app-system-share
  *** LOG addons.xpi: Ignoring file entry whose name is not a valid add-on ID:         C:\Users\PR~1.GRO\AppData\Local\Temp\anonymous768293325561108937webdriver-profile\extensions\webdriver-staging
  *** LOG addons.xpi: checkForChanges
  *** LOG addons.xpi-utils: Opening database
  *** LOG addons.xpi-utils: Creating database schema
  *** LOG addons.xpi: New add-on fxdriver@googlecode.com installed in app-profile
  *** Blocklist::_loadBlocklistFromFile: blocklist is disabled
  *** LOG addons.xpi: New add-on {972ce4c6-7e08-4474-a285-3208198ce6fd} installed in app-global
  *** LOG addons.xpi: New add-on fiddlerhook@fiddler2.com installed in winreg-app-global
  *** LOG addons.xpi: New add-on avg@toolbar installed in winreg-app-global
  *** LOG addons.xpi: New add-on web2pdfextension@web2pdf.adobedotcom installed in winreg-app-global
  *** LOG addons.xpi: Updating database with changes to installed add-ons
  *** LOG addons.xpi-utils: Updating add-on states
  *** LOG addons.xpi-utils: Writing add-ons list
  *** LOG addons.manager: shutdown
  *** LOG addons.xpi: shutdown
  *** LOG addons.xpi-utils: shutdown
  *** LOG addons.xpi-utils: Database closed
  *** LOG addons.xpi: startup
  *** LOG addons.xpi: Skipping unavailable install location app-system-local
  *** LOG addons.xpi: Skipping unavailable install location app-system-share
  *** LOG addons.xpi: Ignoring file entry whose name is not a valid add-on ID: C:\Users\PR~1.GRO\AppData\Local\Temp\anonymous768293325561108937webdriver-profile\extensions\webdriver-staging
  *** LOG addons.xpi: checkForChanges
  *** LOG addons.xpi: No changes found
  
  at OpenQA.Selenium.Remote.RemoteWebDriver.UnpackAndThrowOnError(Response errorResponse) in c:\Projects\WebDriver\trunk\dotnet\src\WebDriver\Remote\RemoteWebDriver.cs:line 1002
  at OpenQA.Selenium.Remote.RemoteWebDriver.Execute(String driverCommandToExecute, Dictionary`2 parameters) in c:\Projects\WebDriver\trunk\dotnet\src\WebDriver\Remote\RemoteWebDriver.cs:line 844
  at OpenQA.Selenium.Remote.RemoteWebDriver.StartSession(ICapabilities desiredCapabilities) in c:\Projects\WebDriver\trunk\dotnet\src\WebDriver\Remote\RemoteWebDriver.cs:line 809
  at OpenQA.Selenium.Remote.RemoteWebDriver..ctor(ICommandExecutor commandExecutor, ICapabilities desiredCapabilities) in c:\Projects\WebDriver\trunk\dotnet\src\WebDriver\Remote\RemoteWebDriver.cs:line 85
  at OpenQA.Selenium.Remote.RemoteWebDriver..ctor(Uri remoteAddress, ICapabilities desiredCapabilities, TimeSpan commandTimeout) in c:\Projects\WebDriver\trunk\dotnet\src\WebDriver\Remote\RemoteWebDriver.cs:line 117
  at OpenQA.Selenium.Remote.RemoteWebDriver..ctor(Uri remoteAddress, ICapabilities desiredCapabilities) in c:\Projects\WebDriver\trunk\dotnet\src\WebDriver\Remote\RemoteWebDriver.cs:line 106
  at SHL.Test.Selenium.ScreenShotRemoteWebDriver..ctor(Uri remoteAddress, ICapabilities desiredCapabilities) in C:\Preethi\vs1\WebTest\SeleniumWebTest\Framework\SHL.Test.Selenium\ScreenShotRemoteWebDriver.cs:line 9
  at SHL.Test.Selenium.TestContext..ctor(Action testRun, ITestEnvironment testEnvironment, DesiredCapabilities desiredCapabilities) in C:\Preethi\vs1\WebTest\SeleniumWebTest\Framework\SHL.Test.Selenium\TestContext.cs:line 31
  at SHL.Test.Selenium.TestBase.InitSelenium(DesiredCapabilities desiredCapabilities, ITestEnvironment testEnvironment, Action testRun) in C:\Preethi\vs1\WebTest\SeleniumWebTest\Framework\SHL.Test.Selenium\TestBase.cs:line 112
  </code></pre>
  
  <p>On debugging, went to Firefox browser add-ons list and found that Firefox webDriver is incompatible with Firefox 20.0
  Current Firefox webdirver version is 2.28.0</p>
  
  <p>Which latest Firefox version can I use or is there any alternative for this issue?</p>