Bug 1126089 - Add test for pageload event on browser element when tab closed (r=smaug)

dom/base/test/browser.ini

@@ -5,6 +5,8 @@ skip-if = e10s # Bug ?????? - test directly touches content (contentWindow.ifram
 [browser_bug902350.js]
 skip-if = e10s # Bug ?????? - test e10s utils don't support load events from iframe etc, which this test relies on.
 [browser_messagemanager_loadprocessscript.js]
+[browser_pagehide_on_tab_close.js]
+skip-if = e10s # this tests non-e10s behavior. it's not expected to work in e10s.
 [browser_state_notifications.js]
 # skip-if = e10s # Bug ?????? - content-document-* notifications come while document's URI is still about:blank, but test expects real URL.
 skip-if = true # Intermittent failures - bug 987493. Restore the skip-if above once fixed

dom/base/test/browser_pagehide_on_tab_close.js

@@ -0,0 +1,17 @@
+function test() {
+  waitForExplicitFinish();
+
+  var tab = gBrowser.addTab();
+  gBrowser.selectedTab = tab;
+
+  tab.linkedBrowser.addEventListener("load", function onload() {
+    tab.linkedBrowser.removeEventListener("load", onload);
+
+    tab.linkedBrowser.addEventListener("pagehide", function() {
+      ok(true, "got page hide event");
+      finish();
+    });
+
+    executeSoon(() => { gBrowser.removeTab(tab); });
+  }, true);
+}