I drew this to Matt's attention privately and it's now in the issue tracker; the plan is to put it only on comment permalink pages (it is to serve some comment indexing purpose) and leave it out again on other views.
Please forward my thanks and appreciation for the prompt fix!
Since I'd tell him by PM, I'm not clear on why there'd be any advantage to me telling him so over you.
The new front page is up.
Previous discussion here.