diff --git a/dom/base/nsGlobalWindow.cpp b/dom/base/nsGlobalWindow.cpp
index 3a0d89f1b5..b53d036e90 100644
--- a/dom/base/nsGlobalWindow.cpp
+++ b/dom/base/nsGlobalWindow.cpp
@@ -542,7 +542,7 @@ DialogValueHolder::Get(JSContext* aCx, JS::Handle<JSObject*> aScope,
 
 class IdleRequestExecutor final : public nsIRunnable
                                 , public nsICancelableRunnable
-                                , public nsIIncrementalRunnable
+                                , public nsIIdleRunnable
 {
 public:
   explicit IdleRequestExecutor(nsGlobalWindow* aWindow)
@@ -586,7 +586,7 @@ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(IdleRequestExecutor)
   NS_INTERFACE_MAP_ENTRY(nsIRunnable)
   NS_INTERFACE_MAP_ENTRY(nsICancelableRunnable)
-  NS_INTERFACE_MAP_ENTRY(nsIIncrementalRunnable)
+  NS_INTERFACE_MAP_ENTRY(nsIIdleRunnable)
   NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIRunnable)
 NS_INTERFACE_MAP_END
 
diff --git a/xpcom/glue/nsThreadUtils.cpp b/xpcom/glue/nsThreadUtils.cpp
index 9128509152..c24b06736b 100644
--- a/xpcom/glue/nsThreadUtils.cpp
+++ b/xpcom/glue/nsThreadUtils.cpp
@@ -60,11 +60,11 @@ CancelableRunnable::Cancel()
   return NS_OK;
 }
 
-NS_IMPL_ISUPPORTS_INHERITED(IncrementalRunnable, CancelableRunnable,
-                            nsIIncrementalRunnable)
+NS_IMPL_ISUPPORTS_INHERITED(IdleRunnable, CancelableRunnable,
+                            nsIIdleRunnable)
 
 void
-IncrementalRunnable::SetDeadline(TimeStamp aDeadline)
+IdleRunnable::SetDeadline(TimeStamp aDeadline)
 {
   // Do nothing
 }
diff --git a/xpcom/glue/nsThreadUtils.h b/xpcom/glue/nsThreadUtils.h
index 01270c1e94..33475fe8fe 100644
--- a/xpcom/glue/nsThreadUtils.h
+++ b/xpcom/glue/nsThreadUtils.h
@@ -14,7 +14,7 @@
 #include "nsIRunnable.h"
 #include "nsICancelableRunnable.h"
 #include "nsIIdlePeriod.h"
-#include "nsIIncrementalRunnable.h"
+#include "nsIIdleRunnable.h"
 #include "nsStringGlue.h"
 #include "nsCOMPtr.h"
 #include "nsAutoPtr.h"
@@ -285,22 +285,22 @@ private:
 };
 
 // This class is designed to be subclassed.
-class IncrementalRunnable : public CancelableRunnable,
-                            public nsIIncrementalRunnable
+class IdleRunnable : public CancelableRunnable,
+                            public nsIIdleRunnable
 {
 public:
   NS_DECL_ISUPPORTS_INHERITED
-  // nsIIncrementalRunnable
+  // nsIIdleRunnable
   virtual void SetDeadline(TimeStamp aDeadline) override;
 
-  IncrementalRunnable() {}
+  IdleRunnable() {}
 
 protected:
-  virtual ~IncrementalRunnable() {}
+  virtual ~IdleRunnable() {}
 private:
-  IncrementalRunnable(const IncrementalRunnable&) = delete;
-  IncrementalRunnable& operator=(const IncrementalRunnable&) = delete;
-  IncrementalRunnable& operator=(const IncrementalRunnable&&) = delete;
+  IdleRunnable(const IdleRunnable&) = delete;
+  IdleRunnable& operator=(const IdleRunnable&) = delete;
+  IdleRunnable& operator=(const IdleRunnable&&) = delete;
 };
 
 namespace detail {
diff --git a/xpcom/threads/moz.build b/xpcom/threads/moz.build
index b09608eba6..b1a91fbf82 100644
--- a/xpcom/threads/moz.build
+++ b/xpcom/threads/moz.build
@@ -22,7 +22,7 @@ XPIDL_MODULE = 'xpcom_threads'
 EXPORTS += [
     'nsEventQueue.h',
     'nsICancelableRunnable.h',
-    'nsIIncrementalRunnable.h',
+    'nsIIdleRunnable.h',
     'nsMemoryPressure.h',
     'nsProcess.h',
     'nsThread.h',
diff --git a/xpcom/threads/nsIIncrementalRunnable.h b/xpcom/threads/nsIIdleRunnable.h
similarity index 62%
rename from xpcom/threads/nsIIncrementalRunnable.h
rename to xpcom/threads/nsIIdleRunnable.h
index 206d189ce0..7263604eba 100644
--- a/xpcom/threads/nsIIncrementalRunnable.h
+++ b/xpcom/threads/nsIIdleRunnable.h
@@ -3,13 +3,13 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-#ifndef nsIIncrementalRunnable_h__
-#define nsIIncrementalRunnable_h__
+#ifndef nsIIdleRunnable_h__
+#define nsIIdleRunnable_h__
 
 #include "nsISupports.h"
 #include "mozilla/TimeStamp.h"
 
-#define NS_IINCREMENTALRUNNABLE_IID \
+#define NS_IIDLERUNNABLE_IID \
 { 0x688be92e, 0x7ade, 0x4fdc, \
 { 0x9d, 0x83, 0x74, 0xcb, 0xef, 0xf4, 0xa5, 0x2c } }
 
@@ -18,10 +18,10 @@
  * A task interface for tasks that can schedule their work to happen
  * in increments bounded by a deadline.
  */
-class nsIIncrementalRunnable : public nsISupports
+class nsIIdleRunnable : public nsISupports
 {
 public:
-  NS_DECLARE_STATIC_IID_ACCESSOR(NS_IINCREMENTALRUNNABLE_IID)
+  NS_DECLARE_STATIC_IID_ACCESSOR(NS_IIDLERUNNABLE_IID)
 
   /**
    * Notify the task of a point in time in the future when the task
@@ -30,11 +30,11 @@ public:
   virtual void SetDeadline(mozilla::TimeStamp aDeadline) = 0;
 
 protected:
-  nsIIncrementalRunnable() { }
-  virtual ~nsIIncrementalRunnable() {}
+  nsIIdleRunnable() { }
+  virtual ~nsIIdleRunnable() {}
 };
 
-NS_DEFINE_STATIC_IID_ACCESSOR(nsIIncrementalRunnable,
-                              NS_IINCREMENTALRUNNABLE_IID)
+NS_DEFINE_STATIC_IID_ACCESSOR(nsIIdleRunnable,
+                              NS_IIDLERUNNABLE_IID)
 
-#endif // nsIIncrementalRunnable_h__
+#endif // nsIIdleRunnable_h__
\ No newline at end of file
diff --git a/xpcom/threads/nsThread.cpp b/xpcom/threads/nsThread.cpp
index 71e71822fa..0d8c8dc196 100644
--- a/xpcom/threads/nsThread.cpp
+++ b/xpcom/threads/nsThread.cpp
@@ -34,7 +34,7 @@
 #include "mozilla/Unused.h"
 #include "mozilla/dom/ScriptSettings.h"
 #include "nsIIdlePeriod.h"
-#include "nsIIncrementalRunnable.h"
+#include "nsIIdleRunnable.h"
 #include "nsThreadSyncDispatch.h"
 #include "LeakRefPtr.h"
 
@@ -1035,7 +1035,7 @@ nsThread::GetIdleEvent(nsIRunnable** aEvent, MutexAutoLock& aProofOfLock)
   mIdleEvents.GetEvent(false, aEvent, aProofOfLock);
 
   if (*aEvent) {
-    nsCOMPtr<nsIIncrementalRunnable> incrementalEvent(do_QueryInterface(*aEvent));
+    nsCOMPtr<nsIIdleRunnable> incrementalEvent(do_QueryInterface(*aEvent));
     if (incrementalEvent) {
       incrementalEvent->SetDeadline(idleDeadline);
     }