Latest Firefox 91 user agents:

User Agent Platform Device
Mozilla/6.0 (Windows NT 10.0; rv:91.0) Gecko/20100101 Firefox/91.0 Windows 10 Unknown
Mozilla/5.0 Gecko/20100101 Firefox/91.0 Unknown Unknown
Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:99.0) Gecko/20100101 Firefox/91.0 Ubuntu Unknown
Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:91.0.2) Gecko/20100101 Firefox/91.0.2 Ubuntu Unknown
Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:91.0) Gecko/20100101 Firefox/91.111 Ubuntu Unknown
Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:91.0) Gecko/20100101 Firefox/91.0,gzip(gfe) Ubuntu Unknown
Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:91.0) Gecko/20100101 Firefox/91.0 [ip:89.251.245.203] Ubuntu Unknown
Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:91) Gecko/20100101 Firefox/91 Ubuntu Unknown
Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:89.0) Gecko/20100101 Firefox/91.0 Ubuntu Unknown
Mozilla/5.0 (X11; Ubuntu; Linux i686; rv:91.0) Gecko/20100101 Firefox/91.0 Ubuntu Unknown
Mozilla/5.0 (X11; Ubuntu; Linux armv7l; rv:91.0) Gecko/20100101 Firefox/91.0 Ubuntu Unknown
Mozilla/5.0 (X11; Ubuntu; Linux aarch64; rv:91.0) Gecko/20100101 Firefox/91.0 Ubuntu Unknown
Mozilla/5.0 (X11; Ubuntu 16.04; Linux x86_64; rv:91.0) Gecko/20100101 Firefox/91.0 Ubuntu 16 Unknown
Mozilla/5.0 (X11; SunOS i86pc; rv:91.0) Gecko/20100101 Firefox/91.0 Solaris Unknown
Mozilla/5.0 (X11; Slackware; Linux x86_64; rv:91.0) Gecko/20100101 Firefox/91.0 Slackware Unknown
Mozilla/5.0 (X11; OpenBSD amd64; rv:91.0) Gecko/20100101 Firefox/91.0 OpenBSD Unknown
Mozilla/5.0 (X11; NetBSD i386; rv:91.0) Gecko/20100101 Firefox/91.0 NetBSD Unknown
Mozilla/5.0 (X11; NetBSD amd64; rv:91.0) Gecko/20100101 Firefox/91.0 NetBSD Unknown
Mozilla/5.0 (X11; Linux x86_64; en-US) Gecko/20062211 Firefox/91.0 GNU/Linux Unknown
Mozilla/5.0 (X11; Linux Mint/20.2; x86_64) Gecko/20100101 Firefox/91.0 Mint 2 Unknown