diff --git a/image/VectorImage.cpp b/image/VectorImage.cpp
index 76ae741ff850..3839e077deff 100644
--- a/image/VectorImage.cpp
+++ b/image/VectorImage.cpp
@@ -62,7 +62,7 @@ public:
     MOZ_ASSERT(mDocWrapper, "Need a non-null SVG document wrapper");
     MOZ_ASSERT(mVectorImage, "Need a non-null VectorImage");
 
-    StartListening();
+    StartObserving();
     Element* elem = GetTarget();
     MOZ_ASSERT(elem, "no root SVG node for us to observe");
 
@@ -79,7 +79,7 @@ public:
 protected:
   virtual ~SVGRootRenderingObserver()
   {
-    StopListening();
+    StopObserving();
   }
 
   virtual Element* GetTarget() override
diff --git a/layout/svg/SVGObserverUtils.cpp b/layout/svg/SVGObserverUtils.cpp
index 4d33ba5cfb0f..5238db9a4740 100644
--- a/layout/svg/SVGObserverUtils.cpp
+++ b/layout/svg/SVGObserverUtils.cpp
@@ -25,7 +25,7 @@ using namespace mozilla;
 using namespace mozilla::dom;
 
 void
-nsSVGRenderingObserver::StartListening()
+nsSVGRenderingObserver::StartObserving()
 {
   Element* target = GetTarget();
   if (target) {
@@ -34,7 +34,7 @@ nsSVGRenderingObserver::StartListening()
 }
 
 void
-nsSVGRenderingObserver::StopListening()
+nsSVGRenderingObserver::StopObserving()
 {
   Element* target = GetTarget();
 
@@ -108,7 +108,7 @@ void
 nsSVGRenderingObserver::NotifyEvictedFromRenderingObserverList()
 {
   mInObserverList = false; // We've been removed from rendering-obs. list.
-  StopListening();            // Remove ourselves from mutation-obs. list.
+  StopObserving();            // Remove ourselves from mutation-obs. list.
 }
 
 void
@@ -184,12 +184,12 @@ nsSVGIDRenderingObserver::nsSVGIDRenderingObserver(nsIURI* aURI,
 {
   // Start watching the target element
   mObservedElementTracker.Reset(aObservingContent, aURI, true, aReferenceImage);
-  StartListening();
+  StartObserving();
 }
 
 nsSVGIDRenderingObserver::~nsSVGIDRenderingObserver()
 {
-  StopListening();
+  StopObserving();
 }
 
 void
@@ -246,7 +246,7 @@ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsSVGFilterReference)
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 
 NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsSVGFilterReference)
-  tmp->StopListening();
+  tmp->StopObserving();
   NS_IMPL_CYCLE_COLLECTION_UNLINK(mObservedElementTracker);
 NS_IMPL_CYCLE_COLLECTION_UNLINK_END
 
diff --git a/layout/svg/SVGObserverUtils.h b/layout/svg/SVGObserverUtils.h
index 2c940aefa3f9..76d414352baa 100644
--- a/layout/svg/SVGObserverUtils.h
+++ b/layout/svg/SVGObserverUtils.h
@@ -40,8 +40,8 @@ class nsSVGFilterChainObserver;
  * "GetTarget()" to specify the piece of SVG content that they'd like to
  * monitor, and they need to implement "DoUpdate" to specify how we'll react
  * when that content gets re-rendered. They also need to implement a
- * constructor and destructor, which should call StartListening and
- * StopListening, respectively.
+ * constructor and destructor, which should call StartObserving and
+ * StopObserving, respectively.
  */
 class nsSVGRenderingObserver : public nsStubMutationObserver
 {
@@ -84,8 +84,8 @@ public:
 
 protected:
   // Non-virtual protected methods
-  void StartListening();
-  void StopListening();
+  void StartObserving();
+  void StopObserving();
 
   // Virtual protected methods
   virtual void DoUpdate() = 0; // called when the referenced resource changes.
@@ -138,9 +138,9 @@ protected:
     {}
   protected:
     virtual void ElementChanged(Element* aFrom, Element* aTo) override {
-      mOwningObserver->StopListening(); // stop observing the old element
+      mOwningObserver->StopObserving(); // stop observing the old element
       IDTracker::ElementChanged(aFrom, aTo);
-      mOwningObserver->StartListening(); // start observing the new element
+      mOwningObserver->StartObserving(); // start observing the new element
       mOwningObserver->DoUpdate();
     }
     /**