Autcomplete On - Greasemonkey extension

autocomplete-on.user.js

// ==UserScript==
// @name        Autocomplete On
// @namespace   http://gist.github.com/gray
// @description Undo the disabling of autocomplete on forms and inputs.
// @include      *
// ==/UserScript==

// Note: other solutions on userscripts.org don't properly handle dynamically
// inserted widgets. This solution uses the new MutationObserver DOM API.

function fixAutocomplete (elem) {
    var tags = ['form', 'input'];
    for (var i = tags.length - 1; i >= 0; i--) {
        var elems = elem.getElementsByTagName(tags[i]);
        if (! elems) next;
        for (var j = elems.length - 1; j >= 0; j--) {
            var attr = elems[j].autocomplete;
            if (attr && 'off' == attr) {
                elems[j].removeAttribute('autocomplete');
            }
        }
    }
}

fixAutocomplete(document);

var observer = new MutationObserver(function(mutations) {
    mutations.forEach( function (mutation) {
        fixAutocomplete(mutation.target);
    });
});
observer.observe(document, {
    subtree: true,
    childList: true,
    attributes: true,
    attributeFilter: ['autocomplete']
});