A modified version of https://github.com/gdovicak/QR-Code-Bookmarklet that uses encodeURIComponent() instead of escape(), so that + symbols are correctly encoded (otherwise they're encoded as spaces). Minified version is on line 1, followed by the full code.

QR code bookmarklet (modified)

var QR=function(){var _this=this;var width=400;var height=400;_this.div=null;baseQRUrl='https://chart.googleapis.com/chart?chs='+width+'x'+height+'&cht=qr&chl=';_this.appendDiv=function(){_this.div=document.createElement('div');_this.div.setAttribute('id','qr-container');_this.div.setAttribute('style','position: absolute; top: 0; left: 0; margin:20px; border-radius: 15px; background-color: #444444;padding:10px; z-index: 1000');_this.div.appendChild(getImage());_this.div.onclick=_this.close;document.getElementsByTagName('body')[0].appendChild(_this.div)};function getImage(){var img=document.createElement('img'),imgSrc=_this.GetQRSrc(_this.GetCurrentPageEncoded());img.setAttribute('src',imgSrc);return img}_this.GetCurrentPageEncoded=function(){return encodeURIComponent(document.URL)};_this.GetQRSrc=function(url){return baseQRUrl+url};_this.close=function(){_this.div.parentNode.removeChild(_this.div)}};var qr=new QR();qr.appendDiv();

var QR = function () {
    var _this = this;
    var width = 400;
    var height = 400;
    _this.div = null;

    baseQRUrl = 'https://chart.googleapis.com/chart?chs=' + width + 'x' + height + '&cht=qr&chl=';

    _this.appendDiv = function () {
        _this.div = document.createElement('div');
        _this.div.setAttribute('id', 'qr-container');
        _this.div.setAttribute('style', 'position: absolute; top: 0; left: 0; margin:20px; border-radius: 15px; background-color: #444444;padding:10px; z-index: 1000');

        _this.div.appendChild(getImage());

        _this.div.onclick = _this.close;

        document.getElementsByTagName('body')[0].appendChild(_this.div);
    };

    function getImage() {
        var img = document.createElement('img'),
        imgSrc = _this.GetQRSrc(_this.GetCurrentPageEncoded());

        img.setAttribute('src', imgSrc);

        return img;
    }

    _this.GetCurrentPageEncoded = function () {
        return encodeURIComponent(document.URL);
    };

    _this.GetQRSrc = function (url) {
        return baseQRUrl + url;
    };


    _this.close = function () {
        _this.div.parentNode.removeChild(_this.div);
    };
}

var qr = new QR();
qr.appendDiv();