Placeholders on edits are not working correctly on Firefox: when you click on the edit, the placeholder text doesn’t disappear.
Worse, when inside an add_more group the edit becomes useless because it appears read-only.

I guess it’s due a faulty javascript script. This script shouldn’t kick in on browsers that support placeholders natively to avoid breaking things.

Reproduced on piklist demos 0.8b5 with latest Firefox. Works fine on Chrome and Internet Explorer though.