From 815c3a822f66c87840f41a488ccdc53ef369d1d9 Mon Sep 17 00:00:00 2001
From: Brendan Dahl <brendan.dahl@gmail.com>
Date: Wed, 3 Aug 2016 14:18:40 -0700
Subject: [PATCH] Bug 1291709 - PdfjsChromeUtils.jsm leaks browser.xul windows.

---
 extensions/firefox/content/PdfjsChromeUtils.jsm | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/extensions/firefox/content/PdfjsChromeUtils.jsm b/extensions/firefox/content/PdfjsChromeUtils.jsm
index 7adb549fd..b5f2a62f2 100644
--- a/extensions/firefox/content/PdfjsChromeUtils.jsm
+++ b/extensions/firefox/content/PdfjsChromeUtils.jsm
@@ -53,7 +53,7 @@ var PdfjsChromeUtils = {
    */
 
   init: function () {
-    this._browsers = new Set();
+    this._browsers = new WeakSet();
     if (!this._ppmm) {
       // global parent process message manager (PPMM)
       this._ppmm = Cc['@mozilla.org/parentprocessmessagemanager;1'].