diff --git a/browser/base/content/test/performance/browser.ini b/browser/base/content/test/performance/browser.ini
index 4907e925fbd0c..57cc5be25c730 100644
--- a/browser/base/content/test/performance/browser.ini
+++ b/browser/base/content/test/performance/browser.ini
@@ -24,9 +24,6 @@ support-files =
 [browser_appmenu.js]
 skip-if =
   asan || debug || (os == 'win' && bits == 32) || (os == 'win' && processor == 'aarch64') # 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 0be2f45758937..0000000000000
--- a/browser/base/content/test/performance/browser_panel_vsync.js
+++ /dev/null
@@ -1,51 +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");
-
-    EventUtils.synthesizeNativeMouseEvent({
-      type: "click",
-      target: downloadsButton,
-      atCenter: true,
-    });
-
-    await TestUtils.waitForCondition(() => !ChromeUtils.vsyncEnabled());
-    ok(!ChromeUtils.vsyncEnabled(), "vsync should still be off");
-    is(
-      DownloadsPanel.panel.state,
-      "closed",
-      "Check that panel state is 'closed'"
-    );
-  }
-);
diff --git a/layout/xul/nsMenuPopupFrame.cpp b/layout/xul/nsMenuPopupFrame.cpp
index 1f842e0495529..fa173f88bcae9 100644
--- a/layout/xul/nsMenuPopupFrame.cpp
+++ b/layout/xul/nsMenuPopupFrame.cpp
@@ -1088,10 +1088,6 @@ void nsMenuPopupFrame::HidePopup(bool aDeselectMenu, nsPopupState aNewState) {
   if (menuFrame) {
     menuFrame->PopupClosed(aDeselectMenu);
   }
-
-  if (auto* widget = GetWidget()) {
-    widget->ClearCachedWebrenderResources();
-  }
 }
 
 nsIFrame::ReflowChildFlags nsMenuPopupFrame::GetXULLayoutFlags() {