Trac's autocomplete.js logs $.browser is undefined

JavaScript error: http://ea5faa5po25cf7fb.onion/projects/tor/chrome/autocomplete/js/autocomplete.js, line 96: TypeError: $.browser is undefined

$.browser.opera && $(input.form).bind("submit.autocomplete", function () {

typeof $.browser.opera !== 'undefined' && $(input.form).bind("submit.autocomplete", function () {

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