add comment has no effect, and clicking
flag brings me to the top of the current page but does nothing. I first noticed it when I followed a notification to someone's comment directed to me, and couldn't comment it. Then I found a post that needed flagging, and I couldn't flag it. Restarted my browser and tried new tabs. Is there something else I can try? Meta works just fine for commenting/flagging/etc.
Firefox 20.0.1. Not sure what other information I can give/you need.