This happened to me. I've moved tabs before, so it doesn't happen all the time...
I was able to reproduce though... If you try to move the First tab (left-most tab) to a different place, you'll get a crash. If you try to move any other tab, even to be in first position (left-most), no crash. Very interesting. Hopefully this crash dump will shed some light. ** Attachment added: "crash dump" http://librarian.launchpad.net/6439350/_usr_lib_firefox_firefox-bin.1000.crash -- Firefox crashes on moving a tab https://launchpad.net/bugs/77663 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs