This appears to be a Firefox problem. I'm not quite sure where in the call chain
we encounter this but as soon as the literal node drops below a (seemingly)
arbitrary length, it displays.

This seems to be related to Firefox's problems with long lines (4k limit) and
breaking up text nodes into adjacent nodes:
https://bugzilla.mozilla.org/show_bug.cgi?id=194231

This is being deferred as it is most likely either unable to be fixed or very
difficult to work around.