jarib/watir-webdriver — Issue #115: Basic Auth not working on FF 
Author: hemanth
Created: 2012-01-13 05:18:51+00:00
State: open

require 'rubygems'
require 'watir-webdriver'
b = Watir::Browser.new
b.goto 'http://mysite:admin@admin123'

That works well in chrome, but not FF!