diff --git a/dom/base/Document.cpp b/dom/base/Document.cpp
index 290fa4baac5b..02df29bb6e07 100644
--- a/dom/base/Document.cpp
+++ b/dom/base/Document.cpp
@@ -1346,8 +1346,6 @@ Document::Document(const char* aContentType)
       mFlashClassification(FlashClassification::Unknown),
       mScrollAnchorAdjustmentLength(0),
       mScrollAnchorAdjustmentCount(0),
-      mCurrentOrientationAngle(0),
-      mCurrentOrientationType(OrientationType::Portrait_primary),
       mServoRestyleRootDirtyBits(0),
       mThrowOnDynamicMarkupInsertionCounter(0),
       mIgnoreOpensDuringUnloadCounter(0),
@@ -13570,12 +13568,6 @@ bool Document::SetOrientationPendingPromise(Promise* aPromise) {
   return true;
 }
 
-void Document::SetRDMPaneOrientation(OrientationType aType, uint16_t aAngle) {
-  if (GetBrowsingContext()->InRDMPane()) {
-    SetCurrentOrientation(aType, aAngle);
-  }
-}
-
 static void DispatchPointerLockChange(Document* aTarget) {
   if (!aTarget) {
     return;
diff --git a/dom/base/Document.h b/dom/base/Document.h
index 2ff664c96237..04dc98c4a8ce 100644
--- a/dom/base/Document.h
+++ b/dom/base/Document.h
@@ -2289,23 +2289,12 @@ class Document : public nsINode,
 
   // ScreenOrientation related APIs
 
-  void SetCurrentOrientation(OrientationType aType, uint16_t aAngle) {
-    mCurrentOrientationType = aType;
-    mCurrentOrientationAngle = aAngle;
-  }
-
-  uint16_t CurrentOrientationAngle() const { return mCurrentOrientationAngle; }
-  OrientationType CurrentOrientationType() const {
-    return mCurrentOrientationType;
-  }
   void ClearOrientationPendingPromise();
   bool SetOrientationPendingPromise(Promise* aPromise);
   Promise* GetOrientationPendingPromise() const {
     return mOrientationPendingPromise;
   }
 
-  void SetRDMPaneOrientation(OrientationType aType, uint16_t aAngle);
-
   //----------------------------------------------------------------------
 
   // Document notification API's
@@ -5248,9 +5237,6 @@ class Document : public nsINode,
   // http://www.w3.org/TR/screen-orientation/
   RefPtr<Promise> mOrientationPendingPromise;
 
-  uint16_t mCurrentOrientationAngle;
-  OrientationType mCurrentOrientationType;
-
   nsTArray<RefPtr<nsFrameLoader>> mInitializableFrameLoaders;
   nsTArray<nsCOMPtr<nsIRunnable>> mFrameLoaderFinalizers;
   RefPtr<nsRunnableMethod<Document>> mFrameLoaderRunner;
diff --git a/dom/webidl/Document.webidl b/dom/webidl/Document.webidl
index 6a8d4c590014..f9228873fc27 100644
--- a/dom/webidl/Document.webidl
+++ b/dom/webidl/Document.webidl
@@ -622,16 +622,6 @@ partial interface Document {
     readonly attribute FeaturePolicy featurePolicy;
 };
 
-/**
- * Document extensions to support devtools.
- */
-partial interface Document {
-  // Extension to give chrome JS the ability to set the window screen
-  // orientation while in RDM.
-  [ChromeOnly]
-  void setRDMPaneOrientation(OrientationType type, float rotationAngle);
-};
-
 // Extension to give chrome JS the ability to specify a non-default keypress
 // event model.
 partial interface Document {