--- a/testing/mochitest/tests/SimpleTest/TestRunner.js
+++ b/testing/mochitest/tests/SimpleTest/TestRunner.js
@@ -558,17 +558,17 @@ TestRunner.testFinished = function(tests
 
         TestRunner.structuredLogger.testEnd(TestRunner.currentTestURL,
                                             "OK",
                                             undefined,
                                             "Finished in " + runtime + "ms",
                                             {runtime: runtime}
         );
 
-        if (TestRunner.slowestTestTime < runtime && TestRunner._timeoutFactor == 1) {
+        if (TestRunner.slowestTestTime < runtime && TestRunner._timeoutFactor >= 1) {
           TestRunner.slowestTestTime = runtime;
           TestRunner.slowestTestURL = TestRunner.currentTestURL;
         }
 
         TestRunner.updateUI(tests);
 
         // Don't show the interstitial if we just run one test with no repeats:
         if (TestRunner._urls.length == 1 && TestRunner.repeat <= 1) {