diff --git a/browser/base/content/browser-feeds.js b/browser/base/content/browser-feeds.js
index 6f134236f262..3e95db0f130d 100644
--- a/browser/base/content/browser-feeds.js
+++ b/browser/base/content/browser-feeds.js
@@ -528,10 +528,7 @@ var FeedHandler = {
     // Ensure we have a pref that is settable
     if (aPrefName && SETTABLE_PREFS.has(aPrefName)) {
       if (aIsComplex) {
-        const supportsString = Cc["@mozilla.org/supports-string;1"].
-                             createInstance(Ci.nsISupportsString);
-        supportsString.data = aPrefValue;
-        Services.prefs.setComplexValue(aPrefName, Ci.nsISupportsString, supportsString);
+        Services.prefs.setStringPref(aPrefName, aPrefValue);
       } else {
         Services.prefs.setCharPref(aPrefName, aPrefValue);
       }
@@ -551,7 +548,7 @@ var FeedHandler = {
 
     if (handler === "web") {
       try {
-        url = prefs.getComplexValue(getPrefWebForType(feedType), Ci.nsISupportsString).data;
+        url = prefs.getStringPref(getPrefWebForType(feedType));
       } catch (ex) {
         LOG("FeedWriter._setSelectedHandler: invalid or no handler in prefs");
         url = null;