Comment 3 for bug 1043819

Given that we know that new versions of XULRunner remove E4X and multi-part streaming support (and will correspondingly break parts of the Evergreen staff client), we should probably just drop this for now... despite the obvious threat introduced by running a XULRunner with many, many known security vulnerabilities at this point.

In any case, I'm going to remove the milestone and pullrequest tag.