Autocomplete On

Searches for autocomplete attributes in the page and sets the value to on.

// ==UserScript==
// @name        Autocomplete On
// @namespace   https://greasyfork.org/en/scripts/4256-autocomplete-on
// @description Searches for autocomplete attributes in the page and sets the value to on.
// @include     *
// @grant       none
// @noframes
// @version     13.0
// ==/UserScript==

function enableAutocomplete()
{
    /* Get all autocomplete attributes */
    var nodeSnapshot = document.evaluate('//*[@autocomplete]', document, null,
        XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE, null),
        numNodeValues = nodeSnapshot.snapshotLength - 1,
        focusedAndBlurred = false,
        formNode = null,
        numFormElements = 0,
        scrollX = window.pageXOffset,
        scrollY = window.pageYOffset,
        activeElement = document.activeElement;
    /* Loop through all the attributes found in the snapshot */
    for (var i = numNodeValues; i >= 0; i--) {
        /*
            Get the attribute snapshot object and
            Change the attribute value to "on"
        */
        nodeSnapshot.snapshotItem(i).setAttribute('autocomplete', 'on');
        /* If element is of type text and autocomplete is set, it's probably the username */
        if (nodeSnapshot.snapshotItem(i).getAttribute('type') == 'text') {
            /*
                Blurring and focusing allows gecko to make suggestions
                immediately when double clicking username
            */
            nodeSnapshot.snapshotItem(i).focus();
            nodeSnapshot.snapshotItem(i).blur();
            focusedAndBlurred = true;
        }
        /* Remember the form node if autocomplete was set on it */
        if (nodeSnapshot.snapshotItem(i).nodeName.toLowerCase() == 'form') {
            formNode = nodeSnapshot.snapshotItem(i);
            numFormElements = formNode.elements.length - 1;
        }
    }
    /*
        If formNode was set and username was not focused and blurred,
        then autocomplete was only set on the form node
    */
    if (formNode != null && ! focusedAndBlurred) {
        for (var i = numFormElements; i >= 0; i--) {
            /* Blur and focus every text field in the form ending with the first field */
            if (formNode.elements[i].getAttribute('type') == 'text') {
                formNode.elements[i].focus();
                formNode.elements[i].blur();
                focusedAndBlurred = true;
            }
        }
    }
    /*
        If form fields were focused and blurred, return to the original
        scroll position and refocus the active element
    */
    if (focusedAndBlurred) {
        activeElement.focus();
 		    /*
       			Create a slight delay before scrolling back to the first scroll position 
            since executing it immediately sometimes doesn't work 
    		*/
	      setTimeout(() => {
  		      window.scrollTo(scrollX, scrollY);
      	}, '1');
    }
}
function newSubmit()
{
    enableAutocomplete();
    if (this._submit !== undefined) {
        this._submit();
    }
}
/* Override DOM submit */
HTMLFormElement.prototype._submit = HTMLFormElement.prototype.submit;
HTMLFormElement.prototype.submit = newSubmit;
/* Run enable on form submit and page load */
window.addEventListener('submit', newSubmit, true);
window.addEventListener('load', enableAutocomplete, false);