diff --git a/browser/base/content/test/performance/browser.ini b/browser/base/content/test/performance/browser.ini
index 7cb9455608eb3..7f1d850d5148a 100644
--- a/browser/base/content/test/performance/browser.ini
+++ b/browser/base/content/test/performance/browser.ini
@@ -31,9 +31,6 @@ skip-if =
   (os == 'win' && bits == 32)
   (os == 'win' && processor == 'aarch64')
   (os == 'linux' && socketprocess_networking) # Bug 1382809, bug 1369959, Win32 because of intermittent OOM failures, bug 1533141 for aarch64
-[browser_panel_vsync.js]
-support-files =
-  !/browser/components/downloads/test/browser/head.js
 [browser_preferences_usage.js]
 https_first_disabled = true
 skip-if =
diff --git a/browser/base/content/test/performance/browser_panel_vsync.js b/browser/base/content/test/performance/browser_panel_vsync.js
deleted file mode 100644
index a00b977ca98f0..0000000000000
--- a/browser/base/content/test/performance/browser_panel_vsync.js
+++ /dev/null
@@ -1,70 +0,0 @@
-/* Any copyright is dedicated to the Public Domain.
-   http://creativecommons.org/publicdomain/zero/1.0/ */
-/* import-globals-from ../../../../components/downloads/test/browser/head.js */
-
-"use strict";
-
-Services.scriptloader.loadSubScript(
-  "chrome://mochitests/content/browser/browser/components/downloads/test/browser/head.js",
-  this
-);
-
-add_task(
-  async function test_opening_panel_and_closing_should_not_leave_vsync() {
-    await SpecialPowers.pushPrefEnv({
-      set: [["browser.download.autohideButton", false]],
-    });
-    await promiseButtonShown("downloads-button");
-
-    const downloadsButton = document.getElementById("downloads-button");
-    const shownPromise = promisePanelOpened();
-    EventUtils.synthesizeNativeMouseEvent({
-      type: "click",
-      target: downloadsButton,
-      atCenter: true,
-    });
-    await shownPromise;
-
-    is(DownloadsPanel.panel.state, "open", "Check that panel state is 'open'");
-
-    await TestUtils.waitForCondition(
-      () => !ChromeUtils.vsyncEnabled(),
-      "Make sure vsync disabled"
-    );
-    // Should not already be using vsync
-    ok(!ChromeUtils.vsyncEnabled(), "vsync should be off initially");
-
-    if (
-      AppConstants.platform == "linux" &&
-      DownloadsPanel.panel.state != "open"
-    ) {
-      // Panels sometime receive spurious popuphiding events on Linux.
-      // Given the main target of this test is Windows, avoid causing
-      // intermittent failures and just make the test return early.
-      todo(
-        false,
-        "panel should still be 'open', current state: " +
-          DownloadsPanel.panel.state
-      );
-      return;
-    }
-
-    const hiddenPromise = BrowserTestUtils.waitForEvent(
-      DownloadsPanel.panel,
-      "popuphidden"
-    );
-    EventUtils.synthesizeKey("VK_ESCAPE", {}, window);
-    await hiddenPromise;
-    await TestUtils.waitForCondition(
-      () => !ChromeUtils.vsyncEnabled(),
-      "wait for vsync to be disabled again"
-    );
-
-    ok(!ChromeUtils.vsyncEnabled(), "vsync should still be off");
-    is(
-      DownloadsPanel.panel.state,
-      "closed",
-      "Check that panel state is 'closed'"
-    );
-  }
-);
diff --git a/gfx/layers/ipc/PWebRenderBridge.ipdl b/gfx/layers/ipc/PWebRenderBridge.ipdl
index 81786c59ffa82..4d5e623a40c50 100644
--- a/gfx/layers/ipc/PWebRenderBridge.ipdl
+++ b/gfx/layers/ipc/PWebRenderBridge.ipdl
@@ -69,7 +69,6 @@ parent:
   sync GetSnapshot(PTexture texture) returns (bool aNeedsYFlip);
   async SetLayersObserverEpoch(LayersObserverEpoch childEpoch);
   async ClearCachedResources();
-  async ClearAnimationResources();
   async SetDefaultClearColor(uint32_t aColor);
   // Invalidate rendered frame
   async InvalidateRenderedFrame();
diff --git a/gfx/layers/wr/WebRenderBridgeParent.cpp b/gfx/layers/wr/WebRenderBridgeParent.cpp
index d3284ca6d8535..abc2ae4daa75c 100644
--- a/gfx/layers/wr/WebRenderBridgeParent.cpp
+++ b/gfx/layers/wr/WebRenderBridgeParent.cpp
@@ -1893,14 +1893,6 @@ mozilla::ipc::IPCResult WebRenderBridgeParent::RecvClearCachedResources() {
   return IPC_OK();
 }
 
-mozilla::ipc::IPCResult WebRenderBridgeParent::RecvClearAnimationResources() {
-  if (!mDestroyed) {
-    ClearAnimationResources();
-  }
-
-  return IPC_OK();
-}
-
 wr::Epoch WebRenderBridgeParent::UpdateWebRender(
     CompositorVsyncScheduler* aScheduler, RefPtr<wr::WebRenderAPI>&& aApi,
     AsyncImagePipelineManager* aImageMgr,
diff --git a/gfx/layers/wr/WebRenderBridgeParent.h b/gfx/layers/wr/WebRenderBridgeParent.h
index a88c8f5162bfd..5054c87350eee 100644
--- a/gfx/layers/wr/WebRenderBridgeParent.h
+++ b/gfx/layers/wr/WebRenderBridgeParent.h
@@ -141,7 +141,6 @@ class WebRenderBridgeParent final : public PWebRenderBridgeParent,
       const LayersObserverEpoch& aChildEpoch) override;
 
   mozilla::ipc::IPCResult RecvClearCachedResources() override;
-  mozilla::ipc::IPCResult RecvClearAnimationResources() override;
   mozilla::ipc::IPCResult RecvInvalidateRenderedFrame() override;
   mozilla::ipc::IPCResult RecvScheduleComposite(
       const wr::RenderReasons& aReasons) override;
diff --git a/gfx/layers/wr/WebRenderLayerManager.cpp b/gfx/layers/wr/WebRenderLayerManager.cpp
index e72b20c03744f..8a3c404e29df5 100644
--- a/gfx/layers/wr/WebRenderLayerManager.cpp
+++ b/gfx/layers/wr/WebRenderLayerManager.cpp
@@ -622,14 +622,6 @@ void WebRenderLayerManager::ClearCachedResources() {
   WrBridge()->EndClearCachedResources();
 }
 
-void WebRenderLayerManager::ClearAnimationResources() {
-  if (!WrBridge()->IPCOpen()) {
-    gfxCriticalNote << "IPC Channel is already torn down unexpectedly\n";
-    return;
-  }
-  WrBridge()->SendClearAnimationResources();
-}
-
 void WebRenderLayerManager::WrUpdated() {
   ClearAsyncAnimations();
   mStateManager.mAsyncResourceUpdates.reset();
diff --git a/gfx/layers/wr/WebRenderLayerManager.h b/gfx/layers/wr/WebRenderLayerManager.h
index ff96fe513eae2..7fdb0b0ba4989 100644
--- a/gfx/layers/wr/WebRenderLayerManager.h
+++ b/gfx/layers/wr/WebRenderLayerManager.h
@@ -102,7 +102,6 @@ class WebRenderLayerManager final : public WindowRenderer {
                     const mozilla::TimeStamp& aCompositeEnd);
 
   void ClearCachedResources();
-  void ClearAnimationResources();
   void UpdateTextureFactoryIdentifier(
       const TextureFactoryIdentifier& aNewIdentifier);
   TextureFactoryIdentifier GetTextureFactoryIdentifier();
diff --git a/layout/xul/nsMenuPopupFrame.cpp b/layout/xul/nsMenuPopupFrame.cpp
index c55270501e0e0..61aa3b1f8e7e7 100644
--- a/layout/xul/nsMenuPopupFrame.cpp
+++ b/layout/xul/nsMenuPopupFrame.cpp
@@ -1098,13 +1098,6 @@ void nsMenuPopupFrame::HidePopup(bool aDeselectMenu, nsPopupState aNewState) {
   mCurrentMenu = nullptr;  // make sure no current menu is set
   mHFlip = mVFlip = false;
 
-  if (auto* widget = GetWidget()) {
-    // Ideally we should call ClearCachedWebrenderResources but there are
-    // intermittent failures (see bug 1748788), so we currently call
-    // ClearWebrenderAnimationResources instead.
-    widget->ClearWebrenderAnimationResources();
-  }
-
   nsView* view = GetView();
   nsViewManager* viewManager = view->GetViewManager();
   viewManager->SetViewVisibility(view, nsViewVisibility_kHide);
diff --git a/widget/nsBaseWidget.cpp b/widget/nsBaseWidget.cpp
index 12cd01d6b2e9d..f182ad8e00e7f 100644
--- a/widget/nsBaseWidget.cpp
+++ b/widget/nsBaseWidget.cpp
@@ -1368,13 +1368,6 @@ void nsBaseWidget::ClearCachedWebrenderResources() {
   mWindowRenderer->AsWebRender()->ClearCachedResources();
 }
 
-void nsBaseWidget::ClearWebrenderAnimationResources() {
-  if (!mWindowRenderer || !mWindowRenderer->AsWebRender()) {
-    return;
-  }
-  mWindowRenderer->AsWebRender()->ClearAnimationResources();
-}
-
 bool nsBaseWidget::SetNeedFastSnaphot() {
   MOZ_ASSERT(XRE_IsParentProcess());
   MOZ_ASSERT(!mCompositorSession);
diff --git a/widget/nsBaseWidget.h b/widget/nsBaseWidget.h
index cf42a3480245e..87599b8ca498d 100644
--- a/widget/nsBaseWidget.h
+++ b/widget/nsBaseWidget.h
@@ -611,8 +611,6 @@ class nsBaseWidget : public nsIWidget, public nsSupportsWeakReference {
 
   void ClearCachedWebrenderResources() override;
 
-  void ClearWebrenderAnimationResources() override;
-
   bool SetNeedFastSnaphot() override;
 
   /**
diff --git a/widget/nsIWidget.h b/widget/nsIWidget.h
index b6e7963ec5981..d5f1c9ff02f20 100644
--- a/widget/nsIWidget.h
+++ b/widget/nsIWidget.h
@@ -1998,11 +1998,6 @@ class nsIWidget : public nsISupports {
    */
   virtual void ClearCachedWebrenderResources() {}
 
-  /**
-   * Clear WebRender animation resources
-   */
-  virtual void ClearWebrenderAnimationResources() {}
-
   /**
    * Request fast snapshot at RenderCompositor of WebRender.
    * Since readback of Windows DirectComposition is very slow.