@Wearwolf@kind.social A friend did further research and apparently it looks for "X11". Quoting:Mozilla/5.0 (X11; Linux x86_64; rv:156.0) Gecko/20100101 Firefox/156.0 --> 403 Mozilla/5.0 (Linux x86_64; rv:156.0) Gecko/20100101 Firefox/156.0 --> 200 Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:156.0) Gecko/20100101 Firefox/156.0 --> 200 Mozilla/5.0 (X11; Windows NT 10.0; Win64; x64; rv:156.0) Gecko/20100101 Firefox/156.0 --> 403