cucumber's selenium test failed and firefox ran blank..... OOOPS, version in-compatibility

I faced my cuke test failing a while back, and recently saw some of my colleagues re-checking their environment settings, cucumber installations and tweaking their cuke-features in different ways..... and I thought I missed spreading a major sports-page news for all headline cuke readers which might have been wasting a lot of time of a lot of people just because the word is not well spread.

Newer Versions of Firefox

are not friendly with 

in-trend Selenium Drivers

So, if you have direct selenium tests failing, or write cucumber/capybara behavioral tests but seek the cause for failure of correct behavior... lookout for a version downgrade for your firefox from whatever 4.x, 5.x or higher Beta versions you have to any of 3.x versions.
And in case of being the victim of same in-compatibility, you would see your tests GREEN again.

Tech-Xpress-Guide so far... from learnings of year 2010

GitHub Repo ~ https://github.com/abhishekkr/a-techXpress-guide

As in what I picked up nicely last year, I did Uploaded few How-To Express Guide in past few months on my SlideShare page ~
http://www.slideshare.net/AbhishekKr/documents

Tech-Xpress-Guide so far ~

[] using SNMP  for secure remote resource monitoring ~
http://www.slideshare.net/AbhishekKr/an-express-guide-ltlt-snmp-for-secure-rremote-resource-monitoring

[] using Nagios for quick & efficient IT Infrastructure monitoring
http://www.slideshare.net/AbhishekKr/an-express-guide-ltlt-nagios-for-it-infrastructure-monitoring

[] using Cacti for IT Infrastructure monitoring with nice analytic graphing
http://www.slideshare.net/AbhishekKr/an-express-guide-cacti-for-it-infrastructure-monitoring-graphing

[] using Zabbix for IT Infrastructure monitoring with easy-to-use Web UI
http://www.slideshare.net/AbhishekKr/an-express-guide-zabbix-for-it-monitoring

[] using DummyNet to mock different Network latencies & bandwidth for testing or other purpose
http://www.slideshare.net/AbhishekKr/an-express-guide-dummynet-for-tweaking-network-latencies-bandwidth

[] creating and using Solaris Native Zones {similar to Linux LXC but much efficient}
http://www.slideshare.net/AbhishekKr/a-tech-xpressguidesolariszonesnativenlxbranded

[] Ethernet Bonding in *Nix for Load Balancing
http://www.slideshare.net/AbhishekKr/a-tech-xpressguideethernetbondingfornics

[] setting up Squid Cache Proxy service
http://www.slideshare.net/AbhishekKr/a-tech-xpressguidesquidforloadbalancingncacheproxy

[] setting Syslog Centralization for *nix machines
http://www.slideshare.net/AbhishekKr/a-tech-xpressguidesyslogcentralizationloggingwithwindows