* [https://bugzilla.mozilla.org/show_bug.cgi?id=618650 Bug 618650: map JS source coordinates to source language that was translated to JS]
* [https://bugzilla.mozilla.org/show_bug.cgi?id=626932 Bug 626932: Shrink JSParseNode] - Would add character-offset to SpiderMonkey (as opposed to line/col).
** Has an incomplete patch by njn. Doesn't compile.
* David Flanagan has been working on adding "//@line ###" style comment support to SpiderMonkey which is being tracked by [https://bugzilla.mozilla.org/show_bug.cgi?id=663934 this bug].