diff --git a/dom/html/HTMLMediaElement.cpp b/dom/html/HTMLMediaElement.cpp
index 47f8e59bc10f..a339bf14e289 100644
--- a/dom/html/HTMLMediaElement.cpp
+++ b/dom/html/HTMLMediaElement.cpp
@@ -4172,13 +4172,6 @@ HTMLMediaElement::WakeLockBoolWrapper::~WakeLockBoolWrapper()
   }
 }
 
-void
-HTMLMediaElement::WakeLockBoolWrapper::SetCanPlay(bool aCanPlay)
-{
-  mCanPlay = aCanPlay;
-  UpdateWakeLock();
-}
-
 void
 HTMLMediaElement::WakeLockBoolWrapper::UpdateWakeLock()
 {
@@ -4188,7 +4181,7 @@ HTMLMediaElement::WakeLockBoolWrapper::UpdateWakeLock()
     return;
   }
 
-  bool playing = (!mValue && mCanPlay);
+  bool playing = !mValue;
 
   if (playing) {
     if (mTimer) {
diff --git a/dom/html/HTMLMediaElement.h b/dom/html/HTMLMediaElement.h
index 85e0bada6c5f..30a9c6d8a180 100644
--- a/dom/html/HTMLMediaElement.h
+++ b/dom/html/HTMLMediaElement.h
@@ -818,12 +818,13 @@ protected:
   class WakeLockBoolWrapper {
   public:
     explicit WakeLockBoolWrapper(bool val = false)
-      : mValue(val), mCanPlay(true), mOuter(nullptr) {}
+      : mValue(val)
+      , mOuter(nullptr)
+    {}
 
     ~WakeLockBoolWrapper();
 
     void SetOuter(HTMLMediaElement* outer) { mOuter = outer; }
-    void SetCanPlay(bool aCanPlay);
 
     MOZ_IMPLICIT operator bool() const { return mValue; }
 
@@ -837,7 +838,6 @@ protected:
     void UpdateWakeLock();
 
     bool mValue;
-    bool mCanPlay;
     HTMLMediaElement* mOuter;
     nsCOMPtr<nsITimer> mTimer;
   };
diff --git a/dom/html/HTMLVideoElement.cpp b/dom/html/HTMLVideoElement.cpp
index af19f32ea422..6aba8dfc00c5 100644
--- a/dom/html/HTMLVideoElement.cpp
+++ b/dom/html/HTMLVideoElement.cpp
@@ -47,7 +47,6 @@ NS_IMPL_ELEMENT_CLONE(HTMLVideoElement)
 
 HTMLVideoElement::HTMLVideoElement(already_AddRefed<NodeInfo>& aNodeInfo)
   : HTMLMediaElement(aNodeInfo)
-  , mUseScreenWakeLock(true)
   , mIsOrientationLocked(false)
 {
 }
@@ -230,19 +229,6 @@ bool HTMLVideoElement::MozHasAudio() const
   return HasAudio();
 }
 
-bool HTMLVideoElement::MozUseScreenWakeLock() const
-{
-  MOZ_ASSERT(NS_IsMainThread(), "Should be on main thread.");
-  return mUseScreenWakeLock;
-}
-
-void HTMLVideoElement::SetMozUseScreenWakeLock(bool aValue)
-{
-  MOZ_ASSERT(NS_IsMainThread(), "Should be on main thread.");
-  mUseScreenWakeLock = aValue;
-  UpdateScreenWakeLock();
-}
-
 JSObject*
 HTMLVideoElement::WrapNode(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
 {
@@ -334,7 +320,7 @@ HTMLVideoElement::UpdateScreenWakeLock()
 {
   bool hidden = OwnerDoc()->Hidden();
 
-  if (mScreenWakeLock && (mPaused || hidden || !mUseScreenWakeLock)) {
+  if (mScreenWakeLock && (mPaused || hidden)) {
     ErrorResult rv;
     mScreenWakeLock->Unlock(rv);
     rv.SuppressException();
@@ -342,8 +328,7 @@ HTMLVideoElement::UpdateScreenWakeLock()
     return;
   }
 
-  if (!mScreenWakeLock && !mPaused && !hidden &&
-      mUseScreenWakeLock && HasVideo()) {
+  if (!mScreenWakeLock && !mPaused && !hidden && HasVideo()) {
     RefPtr<power::PowerManagerService> pmService =
       power::PowerManagerService::GetInstance();
     NS_ENSURE_TRUE_VOID(pmService);
diff --git a/dom/html/HTMLVideoElement.h b/dom/html/HTMLVideoElement.h
index ec1f1e5c9e20..c43bc8cd8a9b 100644
--- a/dom/html/HTMLVideoElement.h
+++ b/dom/html/HTMLVideoElement.h
@@ -129,10 +129,6 @@ public:
 
   bool MozHasAudio() const;
 
-  bool MozUseScreenWakeLock() const;
-
-  void SetMozUseScreenWakeLock(bool aValue);
-
   void NotifyOwnerDocumentActivityChanged() override;
 
   // Gives access to the decoder's frame statistics, if present.
@@ -165,7 +161,6 @@ protected:
   virtual void WakeLockRelease() override;
   void UpdateScreenWakeLock();
 
-  bool mUseScreenWakeLock;
   RefPtr<WakeLock> mScreenWakeLock;
 
   bool mIsOrientationLocked;
diff --git a/dom/webidl/HTMLVideoElement.webidl b/dom/webidl/HTMLVideoElement.webidl
index 6caa4f2f781d..53c612f52858 100644
--- a/dom/webidl/HTMLVideoElement.webidl
+++ b/dom/webidl/HTMLVideoElement.webidl
@@ -46,10 +46,6 @@ partial interface HTMLVideoElement {
   // True if the video has an audio track available.
   readonly attribute boolean mozHasAudio;
 
-  // True if the video should use a screen wake lock.
-  [Pref="dom.wakelock.enabled", Func="Navigator::HasWakeLockSupport"]
-  attribute boolean mozUseScreenWakeLock;
-
   // Attributes for builtin video controls to lock screen orientation.
   // True if video controls should lock orientation when fullscreen.
   [Pref="media.videocontrols.lock-video-orientation", Func="IsChromeOrXBL"]