diff --git a/common/content/dactyl.js b/common/content/dactyl.js
index 84082d1e..76db2f82 100644
--- a/common/content/dactyl.js
+++ b/common/content/dactyl.js
@@ -1642,7 +1642,7 @@ var Dactyl = Module("dactyl", XPCOM(Ci.nsISupportsWeakReference, ModuleBase), {
                 bang: true,
                 completer: function (context) {
                     context.ignoreCase = true;
-                    return completion.dialog(context);
+                    completion.dialog(context);
                 }
             });
 
diff --git a/common/modules/base.jsm b/common/modules/base.jsm
index efdbd106..9e04c492 100644
--- a/common/modules/base.jsm
+++ b/common/modules/base.jsm
@@ -758,6 +758,7 @@ Class.memoize = function memoize(getter)
             this.get = function replace() let (obj = this.instance || this) (
                 Class.replaceProperty(obj, key, null),
                 Class.replaceProperty(obj, key, getter.call(this, key)))
+            this.set = function replace(val) Class.replaceProperty(this.instance || this, val);
         }
     });
 
@@ -1246,6 +1247,9 @@ update(iter, {
      * given predicate.
      */
     nth: function nth(iter, pred, n, self) {
+        if (typeof pred === "number")
+            [pred, n] = [function () true, pred]; // Hack.
+
         for (let elem in iter)
             if (pred.call(self, elem) && n-- === 0)
                 return elem;