Confirming bug. It often occurs, but not only, when starting several downloads in a row. If I'm f.x. downloading a lot of pictures from one site, (right-click save-as), then It's almost certain to crash after a few clicks.
** Attachment added: "Crash-report" http://librarian.launchpad.net/6287440/_usr_lib_firefox_firefox-bin.1000.crash -- Firefox Crashes on Saving Files https://launchpad.net/bugs/45008 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs