On Special:Preferences all sections except the current should be hidden via Javascript. This seems to be broken with 1.19.
I tested with Firefox 3.6.x on mw: and simple: and all sections are visible, as if no Javascript was present. It works in debug mode (i.e. when appending ?debug=true to the URL), and it works on beta.wmflabs.
The Javascript is loaded (I get the file https://bits.wikimedia.org/www.mediawiki.org/load.php?debug=false&lang=en&modules=ext.UserBuckets|ext.translate.selecttoinput|jquery.autoEllipsis%2CcheckboxShiftClick%2CclickTracking%2CcollapsibleTabs%2CdelayedBind%2ChighlightText%2Cjson%2CmakeCollapsible%2Cmw-jump%2Cplaceholder%2Csuggestions%2CtabIndex|mediawiki.action.watch.ajax|mediawiki.api%2Chtmlform%2Cuser|mediawiki.api.watch|mediawiki.legacy.mwsuggest|mediawiki.page.ready|mediawiki.special.preferences&skin=vector&version=20120217T090945Z&*https://bits.wikimedia.org/www.mediawiki.org/load.php?debug=false&lang=en&modules=ext.UserBuckets|ext.translate.selecttoinput|jquery.autoEllipsis%2CcheckboxShiftClick%2CclickTracking%2CcollapsibleTabs%2CdelayedBind%2ChighlightText%2Cjson%2CmakeCollapsible%2Cmw-jump%2Cplaceholder%2Csuggestions%2CtabIndex|mediawiki.action.watch.ajax|mediawiki.api%2Chtmlform%2Cuser|mediawiki.api.watch|mediawiki.legacy.mwsuggest|mediawiki.page.ready|mediawiki.special.preferences&skin=vector&version=20120217T090945Z&*, with the code that should hide the sections) but apparently isn't executed. There are no errors in the Javascript error log. Clearing the cache doesn't help.
Version: 1.19
Severity: normal
URL: https://www.mediawiki.org/wiki/Special:Preferences