Comment 5 for bug 688272

My perception is that adding it contributes fairly negligible overhead. The questions are:

1) Are there any security-related downsides to have them enabled by default?
2) Is this an often-requested feature?

Fortunately the former is easier to address than the latter (i.e., it could just be enabled). I'm certainly in favor of having it enabled, but I'm not well-acquainted with the former.