# File lib/new_relic/control/frameworks/rails.rb, line 98
        def install_developer_mode(rails_config)
          return if defined?(@developer_mode_installed) && @developer_mode_installed
          @developer_mode_installed = true
          if rails_config && rails_config.respond_to?(:middleware)
            begin
              require 'new_relic/rack/developer_mode'
              rails_config.middleware.use NewRelic::Rack::DeveloperMode
              ::NewRelic::Agent.logger.info("New Relic Agent Developer Mode enabled.")
              if env == "production"
                ::NewRelic::Agent.logger.warn("***New Relic Developer Mode is not intended to be enabled in production environments! We highly recommend setting developer_mode: false for the production environment in your newrelic.yml.")
              end
            rescue => e
              ::NewRelic::Agent.logger.warn("Error installing New Relic Developer Mode", e)
            end
          elsif rails_config
            ::NewRelic::Agent.logger.warn("Developer mode not available for Rails versions prior to 2.2")
          end
        end