--- a/browser/base/content/test/performance/browser_windowopen_reflows.js
+++ b/browser/base/content/test/performance/browser_windowopen_reflows.js
@@ -16,34 +16,16 @@ const EXPECTED_REFLOWS = [
   {
     stack: [
       "select@chrome://global/content/bindings/textbox.xml",
       "focusAndSelectUrlBar@chrome://browser/content/browser.js",
     ],
   },
 ];
 
-if (Services.appinfo.OS == "Linux") {
-  if (gMultiProcessBrowser) {
-    EXPECTED_REFLOWS.push({
-      stack: [
-        "handleEvent@chrome://browser/content/tabbrowser.xml",
-      ],
-    });
-  } else {
-    EXPECTED_REFLOWS.push({
-      stack: [
-        "handleEvent@chrome://browser/content/tabbrowser.xml",
-        "inferFromText@chrome://browser/content/browser.js",
-        "handleEvent@chrome://browser/content/browser.js",
-      ],
-    });
-  }
-}
-
 if (Services.appinfo.OS == "WINNT") {
   EXPECTED_REFLOWS.push(
     {
       stack: [
         "verticalMargins@chrome://browser/content/browser-tabsintitlebar.js",
         "_update@chrome://browser/content/browser-tabsintitlebar.js",
         "init@chrome://browser/content/browser-tabsintitlebar.js",
         "handleEvent@chrome://browser/content/tabbrowser.xml",