Place this somewhere that gets loaded when RSpec starts and your browser will automatically show the contents of the webpage when an acceptance spec fails.

capybara.rb

module Capybara
  def auto_save_and_open_page=(val)
    @auto_save_and_open_page = !!val
  end

  def auto_save_and_open_page?
    @auto_save_and_open_page ||= false
  end
end

module Capybara::Node::Finders
  alias :orig_find :find

  def find(*args)
    begin
      orig_find *args
    rescue Capybara::ElementNotFound => e
      session.save_and_open_page if Capybara.auto_save_and_open_page?
      raise e
    end
  end
end

module Capybara::Node::Matchers
  %w[has has_no].each do |has_has_no|
    alias :"orig_#{has_has_no}_selector?" :"#{has_has_no}_selector?"

    class_eval <<-METH, __FILE__, __LINE__ + 1
      def #{has_has_no}_selector?(*args)
        if !(result = orig_#{has_has_no}_selector?(*args)) && Capybara.auto_save_and_open_page?
          session.save_and_open_page
        end
        result
      end
    METH
  end
end

spec_helper.rb

# Somewhere in the file
Capybara.auto_save_and_open_page = true if 'true' == ENV['CAPYBARA_AUTO_SAVE_AND_OPEN_PAGE']