cosmetic only, but some indication of WHERE the error is should be made. Perhaps an arrow next to the line, or highlighting, or something like that.
A Pivotal Tracker story has been created for this Bug: http://www.pivotaltracker.com/story/show/17715079
Mass-closing remaining MozTrap bugs as WONTFIX, due to 1) the Mozilla-hosted instance being decommissioned (see https://wiki.mozilla.org/TestEngineering/Testrail), and, for now, 2) the still-up code archived at its GitHub page: https://github.com/mozilla/moztrap (we'll decide what's next for that, in the near future). See also the history and more-detailed discussion which led us here, at https://groups.google.com/forum/#!topic/mozilla.dev.quality/Sa75hV8Ywvk (If you'd like, you should be able to filter these notification emails using at least the unique string of "Sa75hV8Ywvk" in the message body. Thanks!