string getContent = "function httpGet(theUrl)\n" +
                    "{\n" +
                    "var xmlHttp = null;\n" +
                    "xmlHttp = new XMLHttpRequest();\n" +
                    "xmlHttp.open('GET', theUrl, false );\n" +
                    "xmlHttp.send(null);\n" +
                    "return xmlHttp.responseText;\n" +
                    "}\n" +
                    "var myContent = httpGet(document.location.href);\n" +
                    "var realContent = document.createElement('textarea');\n" +
                    "realContent.value = myContent;\n" +
                    "realContent.style.visibility = 'hidden';\n" +
                    "realContent.setAttribute('id', 'realContent');\n" +
                "document.body.appendChild(realContent);\n";
browser.RunScript(getContent);
string myContent = browser.ElementWithTag("textarea", Find.ById("realContent")).OuterText;