I know `mozilla-expanders.js` has been used but there are problems: 1) it doesn't work if cookies are disabled, 2) no WAI-ARIA support. The privacy policy pages might be visited by privacy-conscious people, so I'd like to enable the accordion even on no-cookie environments. I'll later file a bug to fix those issues.

Thanks for the `overflow: hidden` tip! It worked fine (as always), but the behavior on IE7 is still odd: the expander content doesn't expand until the mouse pointer leaves the expander header. I think we could just disable the accordion on IE7.