From 2126fd5350a562c86e7231eb4dc3e4cae6a18cd7 Mon Sep 17 00:00:00 2001
From: Simon Lydell <simon.lydell@gmail.com>
Date: Sat, 11 Jun 2016 11:25:07 +0200
Subject: [PATCH] Fix `zF` crashing when devtools open in Firefox 49

---
 extension/lib/markable-elements.coffee | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/extension/lib/markable-elements.coffee b/extension/lib/markable-elements.coffee
index ab7179b..e4ddbbc 100644
--- a/extension/lib/markable-elements.coffee
+++ b/extension/lib/markable-elements.coffee
@@ -208,11 +208,12 @@ tryPoint = (elementData, elementRect, x, dx, y, dy, tryRight = 0) ->
     for parent in parents by -1
       # If leaving the devtools container take the devtools zoom into account.
       if utils.isDevtoolsWindow(currentWindow)
-        toolbox = window.top.gDevTools.getToolbox(
-          devtools.TargetFactory.forTab(window.top.gBrowser.selectedTab)
-        )
-        if toolbox
-          devtoolsZoom = toolbox.zoomValue
+        docShell = currentWindow
+          .QueryInterface(Ci.nsIInterfaceRequestor)
+          .getInterface(Ci.nsIWebNavigation)
+          .QueryInterface(Ci.nsIDocShell)
+        if docShell
+          devtoolsZoom = docShell.contentViewer.fullZoom
           offset.left *= devtoolsZoom
           offset.top  *= devtoolsZoom
           x  *= devtoolsZoom
-- 
2.39.3