```ruby
# Rails helper module for footers
module Nyulibraries
  module Assets
    module FooterHelper

      # Library H3lp javascript
      def library_h3lp
        javascript_include_tag "https://libraryh3lp.com/js/libraryh3lp.js?multi"
      end

      # Using Gauges? Only in production!
      def gauges?
        Rails.env.production?
      end

      # Placeholder.
      def gauges_tracking_code
      end

      # Using Google Analytics? Only in production!
      def google_analytics?
        Rails.env.production?
      end

      # Placeholder.
      def google_analytics_tracking_code
      end

      # Using Crazyegg? Only in production!
      def crazyegg?
        Rails.env.production?
      end

      # Placeholder.
      def crazyegg_tracking_code
      end

      def footer_html
        t('footer.footer_html')
      end
    end
  end
end
```

Make including crazyegg code conditional on the presence of an environment variable
user
```ruby
# Rails helper module for footers
module Nyulibraries
  module Assets
    module FooterHelper

      # Library H3lp javascript
      def library_h3lp
        javascript_include_tag "https://libraryh3lp.com/js/libraryh3lp.js?multi"
      end

      # Using Gauges? Only in production!
      def gauges?
        Rails.env.production?
      end

      # Placeholder.
      def gauges_tracking_code
      end

      # Using Google Analytics? Only in production!
      def google_analytics?
        Rails.env.production?
      end

      # Placeholder.
      def google_analytics_tracking_code
      end

      # Using Crazyegg? Only in production! and when CRAZYEGG env var is set
      def crazyegg?
        Rails.env.production? && ENV["CRAZYEGG"]
      end

      def footer_html
        t('footer.footer_html')
      end
    end
  end
end
```
assistant