--- a/browser/extensions/onboarding/test/browser/head.js
+++ b/browser/extensions/onboarding/test/browser/head.js
@@ -51,17 +51,17 @@ function promiseOnboardingOverlayLoaded(
         resolve(false);
       });
     })
   };
   return BrowserTestUtils.waitForCondition(
     condition,
     "Should load onboarding overlay",
     100,
-    30
+    50 // Bug 1381335 increased retries, so debug builds can trigger idle in time
   );
 }
 
 function promiseOnboardingOverlayOpened(browser) {
   let condition = () => {
     return ContentTask.spawn(browser, {}, function() {
       return new Promise(resolve => {
         let overlay = content.document.querySelector("#onboarding-overlay");