diff --git a/dom/bindings/Codegen.py b/dom/bindings/Codegen.py
index 16c6f34230b3..6c33c5a2d877 100644
--- a/dom/bindings/Codegen.py
+++ b/dom/bindings/Codegen.py
@@ -2234,10 +2234,6 @@ def MakeClearCachedValueNativeName(member):
     return "ClearCached%sValue" % MakeNativeName(member.identifier.name)
 
 
-def MakeJSImplClearCachedValueNativeName(member):
-    return "_" + MakeClearCachedValueNativeName(member)
-
-
 def IDLToCIdentifier(name):
     return name.replace("-", "_")
 
@@ -2434,17 +2430,6 @@ class MethodDefiner(PropertyDefiner):
                         "flags": "0",
                         "condition": MemberCondition()
                     })
-            elif not unforgeable:
-                for m in clearableCachedAttrs(descriptor):
-                    attrName = MakeNativeName(m.identifier.name)
-                    self.chrome.append({
-                        "name": "_clearCached%sValue" % attrName,
-                        "nativeName": MakeJSImplClearCachedValueNativeName(m),
-                        "methodInfo": False,
-                        "length": "0",
-                        "flags": "0",
-                        "condition": MemberCondition()
-                    })
 
         self.unforgeable = unforgeable
 
@@ -12418,11 +12403,6 @@ class CGDescriptor(CGThing):
         if descriptor.concrete and descriptor.wrapperCache and not descriptor.proxy:
             cgThings.append(CGClassObjectMovedHook(descriptor))
 
-        # Generate the _ClearCachedFooValue methods before the property arrays that use them.
-        if descriptor.interface.isJSImplemented():
-            for m in clearableCachedAttrs(descriptor):
-                cgThings.append(CGJSImplClearCachedValueMethod(descriptor, m))
-
         properties = PropertyArrays(descriptor)
         cgThings.append(CGGeneric(define=str(properties)))
         cgThings.append(CGNativeProperties(descriptor, properties))
@@ -13938,11 +13918,7 @@ class CGBindingRoot(CGThing):
                     # interface object might have a ChromeOnly constructor.
                     (desc.interface.hasInterfaceObject() and
                      (desc.interface.isJSImplemented() or
-                      (ctor and isChromeOnly(ctor)))) or
-                    # JS-implemented interfaces with clearable cached
-                    # attrs have chromeonly _clearFoo methods.
-                    (desc.interface.isJSImplemented() and
-                     any(clearableCachedAttrs(desc))))
+                      (ctor and isChromeOnly(ctor)))))
 
         # XXXkhuey ugly hack but this is going away soon.
         bindingHeaders['xpcprivate.h'] = webIDLFile.endswith("EventTarget.webidl")
@@ -15130,27 +15106,6 @@ def callbackSetterName(attr, descriptor):
         descriptor.binaryNameFor(attr.identifier.name))
 
 
-class CGJSImplClearCachedValueMethod(CGAbstractBindingMethod):
-    def __init__(self, descriptor, attr):
-        if attr.getExtendedAttribute("StoreInSlot"):
-            raise TypeError("[StoreInSlot] is not supported for JS-implemented WebIDL. See bug 1056325.")
-
-        CGAbstractBindingMethod.__init__(self, descriptor,
-                                         MakeJSImplClearCachedValueNativeName(attr),
-                                         JSNativeArguments())
-        self.attr = attr
-
-    def generate_code(self):
-        return CGGeneric(fill(
-            """
-            ${bindingNamespace}::${fnName}(self);
-            args.rval().setUndefined();
-            return true;
-            """,
-            bindingNamespace=toBindingNamespace(self.descriptor.name),
-            fnName=MakeClearCachedValueNativeName(self.attr)))
-
-
 class CGJSImplGetter(CGJSImplMember):
     """
     Class for generating code for the getters of attributes for a JS-implemented
diff --git a/dom/bindings/test/TestInterfaceJS.js b/dom/bindings/test/TestInterfaceJS.js
index 9ca9785f7df3..f5c4c8b044ea 100644
--- a/dom/bindings/test/TestInterfaceJS.js
+++ b/dom/bindings/test/TestInterfaceJS.js
@@ -23,7 +23,6 @@ TestInterfaceJS.prototype = {
     this._anyArg = anyArg;
     this._objectArg = objectArg;
     this._dictionaryArg = dictionaryArg;
-    this._cachedAttr = 15;
   },
 
   get anyArg() { return this._anyArg; },
@@ -54,10 +53,6 @@ TestInterfaceJS.prototype = {
   pingPongNullableUnion: function(x) { return x; },
   returnBadUnion: function(x) { return 3; },
 
-  get cachedAttr() { return this._cachedAttr; },
-  setCachedAttr: function(n) { this._cachedAttr = n; },
-  clearCachedAttrCache: function () { this.__DOM_IMPL__._clearCachedCachedAttrValue(); },
-
   testSequenceOverload: function(arg) {},
   testSequenceUnion: function(arg) {},
 
diff --git a/dom/bindings/test/mochitest.ini b/dom/bindings/test/mochitest.ini
index 6fa02070ca30..6143c6bcb6f8 100644
--- a/dom/bindings/test/mochitest.ini
+++ b/dom/bindings/test/mochitest.ini
@@ -20,8 +20,6 @@ support-files =
 [test_bug862092.html]
 [test_bug1036214.html]
 skip-if = debug == false
-[test_bug963382.html]
-skip-if = debug == false
 [test_bug1041646.html]
 [test_bug1123875.html]
 [test_barewordGetsWindow.html]
diff --git a/dom/bindings/test/test_bug963382.html b/dom/bindings/test/test_bug963382.html
deleted file mode 100644
index f48d2e8b0fa8..000000000000
--- a/dom/bindings/test/test_bug963382.html
+++ /dev/null
@@ -1,43 +0,0 @@
-<!DOCTYPE HTML>
-<html>
-<!--
-https://bugzilla.mozilla.org/show_bug.cgi?id=963382
--->
-<head>
-  <meta charset="utf-8">
-  <title>Test for Bug 963382</title>
-  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
-  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
-  <script type="application/javascript">
-
-  /** Test for clearing cache attributes in JS-implemented WebIDL implementations. **/
-  SimpleTest.waitForExplicitFinish();
-  SpecialPowers.pushPrefEnv({set: [['dom.expose_test_interfaces', true]]}, go);
-
-  function go() {
-    var t = new TestInterfaceJS();
-
-    // Test [Cached] attribute clearing.
-    is(t.cachedAttr, 15, "Initial value of number");
-
-    t.setCachedAttr(3);
-    is(t.cachedAttr, 15, "Setting the number on the inner JS object should not affect cached value");
-
-    t.clearCachedAttrCache();
-    is(t.cachedAttr, 3, "Setting the number on the inner JS object should affect cached value after clearing the cache.");
-
-    SimpleTest.finish();
-  }
-
-  </script>
-</head>
-<body>
-<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=963382">Mozilla Bug 963382</a>
-<p id="display"></p>
-<div id="content" style="display: none">
-
-</div>
-<pre id="test">
-</pre>
-</body>
-</html>
diff --git a/dom/webidl/TestInterfaceJS.webidl b/dom/webidl/TestInterfaceJS.webidl
index 2757745f0a44..2a03a858de0a 100644
--- a/dom/webidl/TestInterfaceJS.webidl
+++ b/dom/webidl/TestInterfaceJS.webidl
@@ -38,11 +38,6 @@ interface TestInterfaceJS : EventTarget {
   (TestInterfaceJS or long)? pingPongNullableUnion((TestInterfaceJS or long)? something);
   (Location or TestInterfaceJS) returnBadUnion();
 
-  [Cached, Pure]
-  readonly attribute short cachedAttr;
-  void setCachedAttr(short n);
-  void clearCachedAttrCache();
-
   // Test for sequence overloading and union behavior
   void testSequenceOverload(sequence<DOMString> arg);
   void testSequenceOverload(DOMString arg);