diff --git a/browser/components/customizableui/test/browser.ini b/browser/components/customizableui/test/browser.ini
index 9ad4a22231ab..e436b162e032 100644
--- a/browser/components/customizableui/test/browser.ini
+++ b/browser/components/customizableui/test/browser.ini
@@ -130,7 +130,6 @@ skip-if = os == "linux"
 skip-if = e10s # bug 1090635
 [browser_981305_separator_insertion.js]
 [browser_988072_sidebar_events.js]
-skip-if = e10s # bug 1101482 - fails in --run-by-dir
 [browser_989338_saved_placements_not_resaved.js]
 [browser_989751_subviewbutton_class.js]
 [browser_987177_destroyWidget_xul.js]
diff --git a/browser/components/customizableui/test/browser_988072_sidebar_events.js b/browser/components/customizableui/test/browser_988072_sidebar_events.js
index a893bb53b8cb..332a2e23d44a 100644
--- a/browser/components/customizableui/test/browser_988072_sidebar_events.js
+++ b/browser/components/customizableui/test/browser_988072_sidebar_events.js
@@ -80,8 +80,7 @@ let showSidebarPopup = Task.async(function*() {
 
   let subviewShownPromise = subviewShown(subview);
   EventUtils.synthesizeMouseAtCenter(button, {});
-  yield subviewShownPromise;
-  return waitForCondition(() => !subview.panelMultiView.hasAttribute("transitioning"));
+  return subviewShownPromise;
 });
 
 // Check the sidebar widget shows the default items