I can confirm the same behaviour (DjVu plugin crash) on both i386 and amd64 verions of Ubuntu 11.10, trying to open http://historiskakartor.lantmateriet.se/arken/s/show.html?showmap=true&archive=RAK&sd_base=rak2&sd_ktun=52414b5f4a3234332d36382d31&archive=RAK. Fully updated systems 2012-04-14 with Firefox
I can confirm the same behaviour (DjVu plugin crash) on both i386 and amd64 verions of Ubuntu 11.10, trying to open http:// historiskakarto r.lantmateriet. se/arken/ s/show. html?showmap= true&archive= RAK&sd_ base=rak2& sd_ktun= 52414b5f4a32343 32d36382d31& archive= RAK. Fully updated systems 2012-04-14 with Firefox