title: Cron, Ruby and watir-webdriver issue
body: <p>i have simple ruby+watir-webdriver example:</p>
  
  <pre><code>#!/usr/bin/env ruby
  
  require "rubygems"
  require 'watir-webdriver'
  
  browser = Watir::Browser.new
  ...
  # do something
  ...
  browser.close
  </code></pre>
  
  <p>when i run this file manually with:</p>
  
  <pre><code>/path/to/my/ruby/example.rb
  </code></pre>
  
  <p>it works fine. When i put this in cronjob, doesnt work...i've changed the cronjob to </p>
  
  <pre><code>ruby /path/to/my/ruby/example.rb
  </code></pre>
  
  <p>but was again not working. any ideas how to locate the problem?</p>
  
  <p>@Kevin here the output:</p>
  
  <pre><code>/home/lks/.rvm/gems/ruby-1.9.3-p194/gems/selenium-webdriver-2.21.2/lib/selenium/webdriver/firefox/launcher.rb:77:in `connect_until_stable': unable to obtain stable firefox connection in 60 seconds (127.0.0.1:7055) (Selenium::WebDriver::Error::WebDriverError)
          from /home/lks/.rvm/gems/ruby-1.9.3-p194/gems/selenium-webdriver-2.21.2/lib/selenium/webdriver/firefox/launcher.rb:37:in `block in launch'
          from /home/lks/.rvm/gems/ruby-1.9.3-p194/gems/selenium-webdriver-2.21.2/lib/selenium/webdriver/firefox/socket_lock.rb:20:in `locked'
          from /home/lks/.rvm/gems/ruby-1.9.3-p194/gems/selenium-webdriver-2.21.2/lib/selenium/webdriver/firefox/launcher.rb:32:in `launch'
          from /home/lks/.rvm/gems/ruby-1.9.3-p194/gems/selenium-webdriver-2.21.2/lib/selenium/webdriver/firefox/bridge.rb:19:in `initialize'
          from /home/lks/.rvm/gems/ruby-1.9.3-p194/gems/selenium-webdriver-2.21.2/lib/selenium/webdriver/common/driver.rb:31:in `new'
          from /home/lks/.rvm/gems/ruby-1.9.3-p194/gems/selenium-webdriver-2.21.2/lib/selenium/webdriver/common/driver.rb:31:in `for'
          from /home/lks/.rvm/gems/ruby-1.9.3-p194/gems/selenium-webdriver-2.21.2/lib/selenium/webdriver.rb:63:in `for'
          from /home/lks/.rvm/gems/ruby-1.9.3-p194/gems/watir-webdriver-0.6.1/lib/watir-webdriver/browser.rb:35:in `initialize'
  </code></pre>