--- a/browser/base/content/webext-panels.xul
+++ b/browser/base/content/webext-panels.xul
@@ -1,16 +1,17 @@
 <?xml version="1.0"?>
 
 # -*- Mode: Java; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 # This Source Code Form is subject to the terms of the Mozilla Public
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
 <?xml-stylesheet href="chrome://browser/skin/" type="text/css"?>
+<?xml-stylesheet href="chrome://browser/content/usercontext/usercontext.css" type="text/css"?>
 <?xul-overlay href="chrome://global/content/editMenuOverlay.xul"?>
 <?xul-overlay href="chrome://browser/content/places/placesOverlay.xul"?>
 
 <!DOCTYPE page [
 <!ENTITY % browserDTD SYSTEM "chrome://browser/locale/browser.dtd">
 %browserDTD;
 <!ENTITY % textcontextDTD SYSTEM "chrome://global/locale/textcontext.dtd">
 %textcontextDTD;