Backed out changeset c7ca6974f739 (bug 1643998) for causing multiple bc failures. CLOSED TREE

browser/base/content/test/tabs/browser.ini

@@ -81,6 +81,7 @@ support-files = file_new_tab_page.html
 skip-if =
   !e10s
   os == 'linux' && debug && bits == 64  # Pref and test only relevant for e10s, Bug 1581500.
+  fission && (os == "mac" || os == 'linux')  # Bug 1713893 - new Fission platform triage
 [browser_privilegedmozilla_process_pref.js]
 skip-if = !e10s # Pref and test only relevant for e10s.
 [browser_newwindow_tabstrip_overflow.js]

testing/mochitest/BrowserTestUtils/BrowserTestUtilsParent.jsm

@@ -11,15 +11,6 @@ class BrowserTestUtilsParent extends JSWindowActorParent {
     switch (aMessage.name) {
       case "DOMContentLoaded":
       case "load": {
-        // Don't dispatch events that came from stale actors.
-        let bc = this.browsingContext;
-        if (
-          bc.embedderElement.browsingContext != bc ||
-          !(this.manager && this.manager.isCurrentGlobal)
-        ) {
-          return;
-        }
-
         let event = new CustomEvent(
           `BrowserTestUtils:ContentEvent:${aMessage.name}`,
           {