In jQuery 1.9 the $.browser function/property has been removed. So we now get TypeError: $.browser is undefined. This happens here:
https://github.com/sphinx-doc/sphinx/blob/master/sphinx/themes/basic/static/doctools.js#L182
Compare with http://jquery.com/upgrade-guide/1.9/#jquery-browser-removed
http://modernizr.com/ is recommended by the jQuery people.