--- a/browser/components/sessionstore/test/browser_423132.js
+++ b/browser/components/sessionstore/test/browser_423132.js
@@ -68,19 +68,14 @@ function test() {
           cs.removeAll();
           BrowserTestUtils.closeWindow(newWin).then(finish);
         };
 
         function flushAndReady() {
           TabStateFlusher.flush(newWin.gBrowser.selectedBrowser).then(ready);
         }
 
-        if (newWin.gMultiProcessBrowser) {
-          let tab = newWin.gBrowser.selectedTab;
-          promiseTabRestored(tab).then(flushAndReady);
-        } else {
-          flushAndReady();
-        }
+        flushAndReady();
       }, true, testURL);
     });
   }, false);
 }