Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36 Google (+https://developers.google.com/+/web/snippet/)
Mozilla/5.0 (Windows NT 6.1; rv:6.0) Gecko/20110814 Firefox/6.0 Google (+https://developers.google.com/+/web/snippet/)
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.75 Safari/537.36 Google (+https://developers.google.com/+/web/snippet/)
Mozilla/5.0 (compatible; X11; Linux x86_64; Google-StructuredDataTestingTool; +http://www.google.com/webmasters/tools/richsnippets)
