Latest Firefox 56 user agents:

User Agent Platform Device
Mozilla/5.0(Windows NT 10.0;WOW64;rv:56.0)Gecko/20100101 Firefox/56.0 Windows 10 Unknown
Mozilla/5.0 (X11; Ubuntu; Linux) Gecko/20100101 Firefox/56.0 Ubuntu Unknown
Mozilla/5.0 (X11; Ubuntu; Linux i686; rv:56.6) Gecko/20130405 Firefox/56.6 Ubuntu Unknown
Mozilla/5.0 (X11; Ubuntu; Linux i686; rv:56.3) Gecko/20130405 Firefox/56.3 Ubuntu Unknown
Mozilla/5.0 (X11; Ubuntu; Linux i686; rv:56.0) Gecko/20100101 Firefox/56.0.1 Ubuntu Unknown
Mozilla/5.0 (X11; Ubuntu; Linux i686; rv:56.0) Gecko/20100101 Firefox/56.0,gzip(gfe) Ubuntu Unknown
Mozilla/5.0 (X11; Ubuntu; Linux i686) Gecko/20100101 Firefox/56.0 Ubuntu Unknown
Mozilla/5.0 (X11; Ubuntu; Linux i686 on x86_64; rv:56.0) Gecko/20100101 Firefox/56.0 Ubuntu Unknown
Mozilla/5.0 (X11; Ubuntu; Linux amd64; rv:56.0) Gecko/20100101 Firefox/56.0 Ubuntu Unknown
Mozilla/5.0 (X11; OpenBSD amd64; rv:56.0) Gecko/20100101 Firefox/56.0 OpenBSD Unknown
Mozilla/5.0 (X11; Linux x86_64; rv:56.0.2) Gecko/20100101 Firefox/56.0.2 GNU/Linux Unknown
Mozilla/5.0 (x11; Linux x86_64; rv:56.0) Gecko/20170101 Firefox/56.0 GNU/Linux Unknown
Mozilla/5.0 (X11; Linux x86_64; rv:56.0) Gecko/20100101 Firefox/56.0 cuir--bugbounty-CNP-155011 GNU/Linux Unknown
Mozilla/5.0 (X11; Linux i686 on x86_64; rv:56.0.2) Gecko/20100101 Firefox/56.0.2 GNU/Linux Unknown
Mozilla/5.0 (X11; Linux i586; rv:50.1.0) Gecko/20100101 Firefox/56.0.2 GNU/Linux Unknown
Mozilla/5.0 (X11; FreeBSD amd64; rv:56.0) Gecko/20100101 Firefox/56.0 FreeBSD Unknown
Mozilla/5.0 (Windows; Windows NT 6.1; Win64; x64; rv:56.0) Gecko/20100101 Firefox/56.0 Windows 7 Unknown
Mozilla/5.0 (Windows; Windows NT 6.0; Win64; x64; en-US) Gecko/20100101 Firefox/56.3 Windows Vista Unknown
Mozilla/5.0 (Windows; Windows NT 10.0; Win64; x64; rv:56.0) Gecko/20100101 Firefox/56.0 Windows 10 Unknown
Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:56.6) Gecko/20130405 Firefox/56.6 Windows 7 Unknown