ubuntu 12.04 Watir Selenium "Unable to obtain stable firefox connection in 60 seconds" match webdriver version and firefox version
webdriver compatibility
http://selenium.googlecode.com/git/rb/CHANGES
firefox version and reinstall/downgrade
http://selenium.googlecode.com/git/java/CHANGELOG
https://support.mozilla.org/en-US/kb/find-what-version-firefox-you-are-using
https://www.liberiangeek.net/2012/04/how-to-install-previous-versions-of-firefox-in-ubuntu-12-04-precise-pangolin/
ftp://ftp.mozilla.org/pub/firefox/releases/
Current driver version and point specific version
gem update "selenium-webdriver"
gem list
gem 'selenium-webdriver', '2.35.0'
headless
http://watirmelon.com/2011/08/27/running-headless-watir-webdriver-tests-using-a-real-browser/