diff --git a/common/content/dactyl.js b/common/content/dactyl.js
index 53e03869..36bef7fe 100644
--- a/common/content/dactyl.js
+++ b/common/content/dactyl.js
@@ -1386,11 +1386,7 @@ var Dactyl = Module("dactyl", XPCOM(Ci.nsISupportsWeakReference, ModuleBase), {
 
                     if (config.tabbrowser.tabContainer._positionPinnedTabs)
                         config.tabbrowser.tabContainer._positionPinnedTabs();
-                },
-                /*
-                validator: function (opts) dactyl.has("Gecko2") ||
-                    Option.validIf(!/[nN]/.test(opts), "Tab numbering not available in this " + config.host + " version")
-                 */
+                }
             }
         ].filter(group => !group.feature || dactyl.has(group.feature));
 
diff --git a/common/modules/base.jsm b/common/modules/base.jsm
index e08588a9..331000b1 100644
--- a/common/modules/base.jsm
+++ b/common/modules/base.jsm
@@ -30,30 +30,6 @@ let { __lookupGetter__, __lookupSetter__, __defineGetter__, __defineSetter__,
 hasOwnProperty = Function.call.bind(hasOwnProperty);
 propertyIsEnumerable = Function.call.bind(propertyIsEnumerable);
 
-// Gecko 24.
-if (!("find" in Array.prototype))
-    Object.defineProperty(Array.prototype, "find", {
-        configurable: true,
-        writable: true,
-        value: function Array_find(pred, self) {
-            for (let [i, elem] of this.entries())
-                if (pred.call(self, elem, i, this))
-                    return elem;
-        }
-    });
-
-if (!("findIndex" in Array.prototype))
-    Object.defineProperty(Array.prototype, "findIndex", {
-        configurable: true,
-        writable: true,
-        value: function Array_findIndex(pred, self) {
-            for (let [i, elem] of this.entries())
-                if (pred.call(self, elem, i, this))
-                    return i;
-            return -1;
-        }
-    });
-
 function require(module_, target) {
     if (/^[A-Za-z0-9]+:/.test(module_))
         return module(module_);