I had a nearly identical experience with an MOV file here: http://www.gametrailers.com/player.php?id=17125&type=mov&pl=game
I left-clicked instead of downloaded, Totem started, and Firefox crashed without any error messages at all. ** Attachment added: "MOV Crash Data" http://librarian.launchpad.net/6477516/_usr_lib_firefox_firefox-bin.1000.crash -- Crash with totem when opening an MPG link https://launchpad.net/bugs/71315 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs