Pre-requisites Selenium-RC requires the Java Runtime Environment (JRE) version 1.5.0 or higher Step 1: Install the Selenium gem sudo gem install Selenium Step 2: Install Selenium-remote Unfortunately the jar that the Selenium gem (version 1.1.14) comes with does not work with Firefox 3. So we have to get the latest jar from the Selenium-RC site: Download the Selenium RC Beta 2: http://seleniumhq.o