--- a/browser/components/nsBrowserContentHandler.js
+++ b/browser/components/nsBrowserContentHandler.js
@@ -783,18 +783,18 @@ nsDefaultCommandLineHandler.prototype = 
             var url = uri.QueryInterface(Components.interfaces.nsIURL);
             var params = new URLSearchParams(url.query);
             // We don't want to rewrite all Bing URLs coming from external apps. Look
             // for the magic URL parm that's present in searches from the task bar.
             // * Typed searches use "form=WNSGPH"
             // * Cortana voice searches use "FORM=WNSBOX" or direct results, or "FORM=WNSFC2"
             //   for "see more results on Bing.com")
             // * Cortana voice searches started from "Hey, Cortana" use "form=WNSHCO"
-            //   or "form=WNSSSV"
-            var allowedParams = ["WNSGPH", "WNSBOX", "WNSFC2", "WNSHCO", "WNSSSV"];
+            //   or "form=WNSSSV" or "form=WNSSCX"
+            var allowedParams = ["WNSGPH", "WNSBOX", "WNSFC2", "WNSHCO", "WNSSCX", "WNSSSV"];
             var formParam = params.get("form");
             if (!formParam) {
               formParam = params.get("FORM");
             }
             if (allowedParams.indexOf(formParam) != -1) {
               var term = params.get("q");
               var ss = Components.classes["@mozilla.org/browser/search-service;1"]
                                  .getService(nsIBrowserSearchService);