From 5e416ec22dc018a953d4f1b22ea2dac13cc83a32 Mon Sep 17 00:00:00 2001
From: win7-7 <win7-7@users.noreply.github.com>
Date: Sun, 14 Jul 2019 23:08:23 +0300
Subject: Dispatch a PluginRemoved event for actual plugins, not
 images/unknown/iframe-type <objects>

If a page uses or removes many <object> elements which are not actually plugins, loading the page goes to a crawl because UXP recalculates the plugin UI every time.

Only dispatch a PluginRemoved event for actual plugins.
---
 dom/base/nsObjectLoadingContent.cpp | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/dom/base/nsObjectLoadingContent.cpp b/dom/base/nsObjectLoadingContent.cpp
index c1b732258..3c850c4cd 100644
--- a/dom/base/nsObjectLoadingContent.cpp
+++ b/dom/base/nsObjectLoadingContent.cpp
@@ -715,11 +715,13 @@ nsObjectLoadingContent::UnbindFromTree(bool aDeep, bool aNullParent)
     ///             would keep the docshell around, but trash the frameloader
     UnloadObject();
   }
-  nsIDocument* doc = thisContent->GetComposedDoc();
-  if (doc && doc->IsActive()) {
+  if (mType == eType_Plugin) {
+    nsIDocument* doc = thisContent->GetComposedDoc();
+    if (doc && doc->IsActive()) {
     nsCOMPtr<nsIRunnable> ev = new nsSimplePluginEvent(doc,
                                                        NS_LITERAL_STRING("PluginRemoved"));
     NS_DispatchToCurrentThread(ev);
+    }
   }
 }
 
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