From f2f653945e1c13b7e7d22fa287d5af998cb76656 Mon Sep 17 00:00:00 2001
From: gorhill <rhill@raymondhill.net>
Date: Wed, 2 Dec 2015 01:13:56 -0500
Subject: [PATCH] can throw when trying to access `associatedWindow`

---
 platform/firefox/vapi-background.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/platform/firefox/vapi-background.js b/platform/firefox/vapi-background.js
index 9d52f91b9..4be5e56ab 100644
--- a/platform/firefox/vapi-background.js
+++ b/platform/firefox/vapi-background.js
@@ -1936,7 +1936,10 @@ var httpObserver = {
         if ( lc.topFrameElement ) {
             return tabWatcher.tabIdFromTarget(lc.topFrameElement);
         }
-        var win = lc.associatedWindow;
+        var win;
+        try {
+            win = lc.associatedWindow;
+        } catch (ex) { }
         if ( !win ) { return vAPI.noTabId; }
         if ( win.top ) {
             win = win.top;