diff --git a/browser/components/urlbar/UrlbarPrefs.sys.mjs b/browser/components/urlbar/UrlbarPrefs.sys.mjs
index 417e2938b68a..77e0cd845d95 100644
--- a/browser/components/urlbar/UrlbarPrefs.sys.mjs
+++ b/browser/components/urlbar/UrlbarPrefs.sys.mjs
@@ -67,6 +67,11 @@ const PREF_URLBAR_DEFAULTS = new Map([
   // Feature gate pref for clipboard suggestions in the urlbar.
   ["clipboard.featureGate", false],
 
+  // Whether to close other panels when the urlbar panel opens.
+  // This feature gate exists just as an emergency rollback in case of
+  // unexpected issues in Release. We normally want this behavior.
+  ["closeOtherPanelsOnOpen", true],
+
   // Whether to show a link for using the search functionality provided by the
   // active view if the the view utilizes OpenSearch.
   ["contextualSearch.enabled", true],
diff --git a/browser/components/urlbar/UrlbarView.sys.mjs b/browser/components/urlbar/UrlbarView.sys.mjs
index c5ea040f1f18..3b7bd025b534 100644
--- a/browser/components/urlbar/UrlbarView.sys.mjs
+++ b/browser/components/urlbar/UrlbarView.sys.mjs
@@ -1095,6 +1095,13 @@ export class UrlbarView {
     this.window.addEventListener("blur", this);
 
     this.controller.notify(this.controller.NOTIFICATIONS.VIEW_OPEN);
+
+    if (lazy.UrlbarPrefs.get("closeOtherPanelsOnOpen")) {
+      this.window.docShell.treeOwner
+        .QueryInterface(Ci.nsIInterfaceRequestor)
+        .getInterface(Ci.nsIAppWindow)
+        .rollupAllPopups();
+    }
   }
 
   #shouldShowHeuristic(result) {
diff --git a/browser/components/urlbar/tests/browser/browser.toml b/browser/components/urlbar/tests/browser/browser.toml
index 3935532598c4..b9e31e00e86b 100644
--- a/browser/components/urlbar/tests/browser/browser.toml
+++ b/browser/components/urlbar/tests/browser/browser.toml
@@ -175,6 +175,8 @@ support-files = [
 
 ["browser_closePanelOnClick.js"]
 
+["browser_close_other_panels.js"]
+
 ["browser_content_opener.js"]
 
 ["browser_contextualsearch.js"]
diff --git a/browser/components/urlbar/tests/browser/browser_close_other_panels.js b/browser/components/urlbar/tests/browser/browser_close_other_panels.js
new file mode 100644
index 000000000000..c6b7f87ec1fc
--- /dev/null
+++ b/browser/components/urlbar/tests/browser/browser_close_other_panels.js
@@ -0,0 +1,42 @@
+/* Any copyright is dedicated to the Public Domain.
+ * https://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * This tests that other panels close when the urlbar panel opens.
+ */
+
+"use strict";
+
+const { CustomizableUITestUtils } = ChromeUtils.importESModule(
+  "resource://testing-common/CustomizableUITestUtils.sys.mjs"
+);
+let gCUITestUtils = new CustomizableUITestUtils(window);
+
+add_task(async function () {
+  for (let openFn of [
+    () => {
+      EventUtils.synthesizeMouseAtCenter(gURLBar.inputField, {});
+    },
+    () => {
+      EventUtils.synthesizeKey("l", { accelKey: true });
+    },
+  ]) {
+    await gCUITestUtils.openMainMenu();
+    Assert.equal(
+      PanelUI.panel.state,
+      "open",
+      "Check that panel state is 'open'"
+    );
+    let promiseHidden = new Promise(resolve => {
+      PanelUI.panel.addEventListener("popuphidden", resolve, { once: true });
+    });
+    await UrlbarTestUtils.promisePopupOpen(window, openFn);
+    await promiseHidden;
+    Assert.equal(
+      PanelUI.panel.state,
+      "closed",
+      "Check that panel state is 'closed'"
+    );
+    await UrlbarTestUtils.promisePopupClose(window);
+  }
+});
diff --git a/xpfe/appshell/AppWindow.cpp b/xpfe/appshell/AppWindow.cpp
index 65c21e9579f5..8f87bbd1fb8c 100644
--- a/xpfe/appshell/AppWindow.cpp
+++ b/xpfe/appshell/AppWindow.cpp
@@ -533,6 +533,13 @@ NS_IMETHODIMP AppWindow::ShowModal() {
   return mModalStatus;
 }
 
+NS_IMETHODIMP AppWindow::RollupAllPopups() {
+  if (nsXULPopupManager* pm = nsXULPopupManager::GetInstance()) {
+    pm->Rollup({});
+  }
+  return NS_OK;
+}
+
 //*****************************************************************************
 // AppWindow::nsIBaseWindow
 //*****************************************************************************
diff --git a/xpfe/appshell/nsIAppWindow.idl b/xpfe/appshell/nsIAppWindow.idl
index d373043bac89..0ef6425a2dde 100644
--- a/xpfe/appshell/nsIAppWindow.idl
+++ b/xpfe/appshell/nsIAppWindow.idl
@@ -152,4 +152,11 @@ interface nsIAppWindow : nsISupports
    * Since readback of Windows DirectComposition is very slow.
    */
   void needFastSnaphot();
+
+  /**
+   * Ask the PopupManager to rollup all popups.
+   * Can be used by popup-like elements to close other popups when shown.
+   * Note that tooltips and noautohide popups won't be closed.
+   */
+  void rollupAllPopups();
 };