diff --git a/accessible/src/base/moz.build b/accessible/src/base/moz.build
index af814ccaa68d..224d84492a66 100644
--- a/accessible/src/base/moz.build
+++ b/accessible/src/base/moz.build
@@ -64,7 +64,7 @@ LOCAL_INCLUDES += [
     '../../../layout/generic',
     '../../../layout/style',
     '../../../layout/svg',
-    '../../../layout/xul',
+    '../../../layout/xul/base/src',
     '../../../layout/xul/tree/',
     '../generic',
     '../html',
diff --git a/accessible/src/generic/moz.build b/accessible/src/generic/moz.build
index 2694aed6b178..5db24877cd10 100644
--- a/accessible/src/generic/moz.build
+++ b/accessible/src/generic/moz.build
@@ -27,7 +27,7 @@ UNIFIED_SOURCES += [
 
 LOCAL_INCLUDES += [
     '../../../layout/generic',
-    '../../../layout/xul',
+    '../../../layout/xul/base/src',
     '../base',
     '../html',
     '../xpcom',
diff --git a/accessible/src/html/moz.build b/accessible/src/html/moz.build
index c5d249db2b49..4452eb34e973 100644
--- a/accessible/src/html/moz.build
+++ b/accessible/src/html/moz.build
@@ -18,7 +18,7 @@ UNIFIED_SOURCES += [
 LOCAL_INCLUDES += [
     '../../../layout/generic',
     '../../../layout/tables',
-    '../../../layout/xul',
+    '../../../layout/xul/base/src',
     '../base',
     '../generic',
     '../xpcom',
diff --git a/accessible/src/mac/moz.build b/accessible/src/mac/moz.build
index c175be69e193..91a37b16f877 100644
--- a/accessible/src/mac/moz.build
+++ b/accessible/src/mac/moz.build
@@ -32,7 +32,7 @@ LOCAL_INCLUDES += [
     '../html',
     '../xul',
     '/layout/generic',
-    '/layout/xul',
+    '/layout/xul/base/src',
     '/widget/cocoa',
     '/widget/xpwidgets',
 ]
diff --git a/accessible/src/xul/moz.build b/accessible/src/xul/moz.build
index fd1f5ba117be..6584b0b55c8b 100644
--- a/accessible/src/xul/moz.build
+++ b/accessible/src/xul/moz.build
@@ -21,8 +21,8 @@ UNIFIED_SOURCES += [
 
 LOCAL_INCLUDES += [
     '../../../layout/generic',
-    '../../../layout/xul',
-    '../../../layout/xul/tree',
+    '../../../layout/xul/base/src',
+    '../../../layout/xul/tree//',
     '../base',
     '../generic',
     '../html',
diff --git a/content/base/src/moz.build b/content/base/src/moz.build
index da356a949d4f..c37867568c8a 100644
--- a/content/base/src/moz.build
+++ b/content/base/src/moz.build
@@ -215,6 +215,6 @@ LOCAL_INCLUDES += [
     '/layout/generic',
     '/layout/style',
     '/layout/svg',
-    '/layout/xul',
+    '/layout/xul/base/src',
     '/netwerk/base/src',
 ]
diff --git a/content/canvas/src/moz.build b/content/canvas/src/moz.build
index fe1cd29f2c14..de0a7dfe167c 100644
--- a/content/canvas/src/moz.build
+++ b/content/canvas/src/moz.build
@@ -95,6 +95,6 @@ LOCAL_INCLUDES += [
     '/js/xpconnect/src',
     '/layout/generic',
     '/layout/style',
-    '/layout/xul',
+    '/layout/xul/base/src',
 ]
 
diff --git a/content/events/src/moz.build b/content/events/src/moz.build
index c4c306f01fd4..3deaa99424ed 100644
--- a/content/events/src/moz.build
+++ b/content/events/src/moz.build
@@ -87,7 +87,7 @@ LOCAL_INCLUDES += [
     '/dom/settings',
     '/dom/src/storage',
     '/layout/generic',
-    '/layout/xul',
+    '/layout/xul/base/src',
     '/layout/xul/tree/',
 ]
 
diff --git a/content/html/content/src/moz.build b/content/html/content/src/moz.build
index b27e1d8c960e..478346192d83 100644
--- a/content/html/content/src/moz.build
+++ b/content/html/content/src/moz.build
@@ -179,7 +179,7 @@ LOCAL_INCLUDES += [
     '/layout/generic',
     '/layout/style',
     '/layout/tables',
-    '/layout/xul',
+    '/layout/xul/base/src',
     '/netwerk/base/src',
     '/xpcom/ds',
 ]
diff --git a/content/media/moz.build b/content/media/moz.build
index b09fbca9bb3f..4ed1347e042e 100644
--- a/content/media/moz.build
+++ b/content/media/moz.build
@@ -164,7 +164,7 @@ FINAL_LIBRARY = 'gklayout'
 LOCAL_INCLUDES += [
     '/content/base/src',
     '/layout/generic',
-    '/layout/xul',
+    '/layout/xul/base/src',
 ]
 
 if CONFIG['MOZ_DIRECTSHOW']:
diff --git a/content/svg/content/src/moz.build b/content/svg/content/src/moz.build
index 302a7dde506b..8b13994c1e99 100644
--- a/content/svg/content/src/moz.build
+++ b/content/svg/content/src/moz.build
@@ -259,6 +259,6 @@ LOCAL_INCLUDES += [
     '/layout/generic',
     '/layout/style',
     '/layout/svg',
-    '/layout/xul',
+    '/layout/xul/base/src',
 ]
 
diff --git a/content/xul/content/src/moz.build b/content/xul/content/src/moz.build
index 282472b45958..71467e7762bf 100644
--- a/content/xul/content/src/moz.build
+++ b/content/xul/content/src/moz.build
@@ -26,7 +26,7 @@ LOCAL_INCLUDES += [
     '/content/xml/document/src',
     '/layout/generic',
     '/layout/style',
-    '/layout/xul',
+    '/layout/xul/base/src',
     '/xpcom/ds',
 ]
 
diff --git a/content/xul/document/src/moz.build b/content/xul/document/src/moz.build
index 7ec6cc3f5292..0b877f4b9eca 100644
--- a/content/xul/document/src/moz.build
+++ b/content/xul/document/src/moz.build
@@ -33,7 +33,7 @@ LOCAL_INCLUDES += [
     '/layout/base',
     '/layout/generic',
     '/layout/style',
-    '/layout/xul',
+    '/layout/xul/base/src',
     '/xpcom/ds',
 ]
 
diff --git a/docshell/base/moz.build b/docshell/base/moz.build
index 5db6181b7a32..f772af88a904 100644
--- a/docshell/base/moz.build
+++ b/docshell/base/moz.build
@@ -79,7 +79,7 @@ LOCAL_INCLUDES += [
     '/dom/base',
     '/layout/base',
     '/layout/generic',
-    '/layout/xul',
+    '/layout/xul/base/src',
     '/netwerk/protocol/viewsource',
     '/xpcom/ds',
 ]
diff --git a/dom/base/moz.build b/dom/base/moz.build
index 95b3f93d6442..6f5bdaef6e4d 100644
--- a/dom/base/moz.build
+++ b/dom/base/moz.build
@@ -145,7 +145,7 @@ LOCAL_INCLUDES += [
     '/content/xul/document/src',
     '/layout/generic',
     '/layout/style',
-    '/layout/xul',
+    '/layout/xul/base/src',
 ]
 
 if CONFIG['MOZ_WIDGET_TOOLKIT'] == 'gonk':
diff --git a/dom/plugins/base/moz.build b/dom/plugins/base/moz.build
index 8781a1eb9735..a11fd025c25a 100644
--- a/dom/plugins/base/moz.build
+++ b/dom/plugins/base/moz.build
@@ -107,7 +107,7 @@ LOCAL_INCLUDES += [
     '/gfx/skia/include/config',
     '/gfx/skia/include/core',
     '/layout/generic',
-    '/layout/xul',
+    '/layout/xul/base/src',
     '/widget/android',
     '/widget/xpwidgets',
     '/xpcom/base',
diff --git a/editor/libeditor/html/moz.build b/editor/libeditor/html/moz.build
index f2c34220e259..25be2d71fcd4 100644
--- a/editor/libeditor/html/moz.build
+++ b/editor/libeditor/html/moz.build
@@ -36,7 +36,7 @@ LOCAL_INCLUDES += [
     '/layout/generic',
     '/layout/style',
     '/layout/tables',
-    '/layout/xul',
+    '/layout/xul/base/src',
 ]
 
 FINAL_LIBRARY = 'gklayout'
diff --git a/layout/base/moz.build b/layout/base/moz.build
index 62a18efe7ab0..4626a98ee966 100644
--- a/layout/base/moz.build
+++ b/layout/base/moz.build
@@ -126,7 +126,7 @@ LOCAL_INCLUDES += [
     '../style',
     '../svg',
     '../tables',
-    '../xul',
+    '../xul/base/src',
     '../xul/tree/',
     '/docshell/base',
     '/xpcom/ds',
diff --git a/layout/build/moz.build b/layout/build/moz.build
index 12b89a916c9c..57fa009f0a7c 100644
--- a/layout/build/moz.build
+++ b/layout/build/moz.build
@@ -37,7 +37,7 @@ LOCAL_INCLUDES += [
     '../mathml',
     '../style',
     '../tables',
-    '../xul',
+    '../xul/base/src',
     '/caps/include',
     '/content/base/src',
     '/content/canvas/src',
diff --git a/layout/forms/moz.build b/layout/forms/moz.build
index 6ffd5477fd77..5a76ad2fa247 100644
--- a/layout/forms/moz.build
+++ b/layout/forms/moz.build
@@ -50,5 +50,5 @@ LOCAL_INCLUDES += [
     '../../editor/txmgr/src',
     '../base',
     '../generic',
-    '../xul',
+    '../xul/base/src',
 ]
diff --git a/layout/generic/moz.build b/layout/generic/moz.build
index b4785819f4d4..474857ce2c27 100644
--- a/layout/generic/moz.build
+++ b/layout/generic/moz.build
@@ -119,5 +119,5 @@ LOCAL_INCLUDES += [
     '../style',
     '../svg',
     '../tables',
-    '../xul',
+    '../xul/base/src',
 ]
diff --git a/layout/ipc/moz.build b/layout/ipc/moz.build
index aebe290082b8..1cf998ec0f74 100644
--- a/layout/ipc/moz.build
+++ b/layout/ipc/moz.build
@@ -29,5 +29,5 @@ LOCAL_INCLUDES += [
     '/content/base/src',
     '/layout/base',
     '/layout/generic',
-    '/layout/xul',
+    '/layout/xul/base/src',
 ]
diff --git a/layout/mathml/moz.build b/layout/mathml/moz.build
index ef8a2cb7e698..b24f2922ffd0 100644
--- a/layout/mathml/moz.build
+++ b/layout/mathml/moz.build
@@ -37,7 +37,7 @@ LOCAL_INCLUDES += [
     '../generic',
     '../style',
     '../tables',
-    '../xul',
+    '../xul/base/src',
     '/content/base/src',
     '/content/mathml/content/src',
 ]
diff --git a/layout/moz.build b/layout/moz.build
index a311fad2dc5b..b087271b4711 100644
--- a/layout/moz.build
+++ b/layout/moz.build
@@ -11,7 +11,8 @@ PARALLEL_DIRS += [
     'forms',
     'tables',
     'svg',
-    'xul',
+    'xul/base/public',
+    'xul/base/src',
     'ipc',
     'mathml',
     'inspector',
@@ -21,6 +22,15 @@ PARALLEL_DIRS += [
 if CONFIG['NS_PRINTING']:
     PARALLEL_DIRS += ['printing']
 
+if CONFIG['MOZ_XUL']:
+    PARALLEL_DIRS += ['xul/tree', 'xul/grid']
+
+if CONFIG['ENABLE_TESTS']:
+    PARALLEL_DIRS += [
+        'xul/test',
+        'xul/base/test',
+    ]
+
 TEST_TOOL_DIRS += [
     'tools/reftest',
     'reftests/fonts',
diff --git a/layout/reftests/reftest.list b/layout/reftests/reftest.list
index 36e6e201f58a..3c3bb056e81c 100644
--- a/layout/reftests/reftest.list
+++ b/layout/reftests/reftest.list
@@ -328,7 +328,7 @@ skip-if(B2G) include xul/reftest.list
 include webcomponents/reftest.list
 
 # xul
-skip-if(B2G) include ../xul/reftest/reftest.list
+skip-if(B2G) include ../xul/base/reftest/reftest.list
 
 # xul grid
 skip-if(B2G) include ../xul/grid/reftests/reftest.list
diff --git a/layout/style/moz.build b/layout/style/moz.build
index e9593e959eb1..8abf9e937440 100644
--- a/layout/style/moz.build
+++ b/layout/style/moz.build
@@ -141,6 +141,6 @@ LOCAL_INCLUDES += [
     '../../content/xul/document/src',
     '../base',
     '../generic',
-    '../xul',
+    '../xul/base/src',
     '/dom/base',
 ]
diff --git a/layout/svg/moz.build b/layout/svg/moz.build
index c70a8e2fbec5..c1fa9658db1e 100644
--- a/layout/svg/moz.build
+++ b/layout/svg/moz.build
@@ -56,6 +56,6 @@ LOCAL_INCLUDES += [
     '../base',
     '../generic',
     '../style',
-    '../xul',
+    '../xul/base/src',
 ]
 
diff --git a/layout/tables/moz.build b/layout/tables/moz.build
index 48ef2cdc95bc..60a5c622790b 100644
--- a/layout/tables/moz.build
+++ b/layout/tables/moz.build
@@ -38,7 +38,7 @@ LOCAL_INCLUDES += [
     '../base',
     '../generic',
     '../style',
-    '../xul',
+    '../xul/base/src',
 ]
 
 DEFINES['DEBUG_TABLE_STRATEGY_off'] = True
diff --git a/layout/xul/base/public/moz.build b/layout/xul/base/public/moz.build
new file mode 100644
index 000000000000..e1a84a9039e8
--- /dev/null
+++ b/layout/xul/base/public/moz.build
@@ -0,0 +1,27 @@
+# -*- Mode: python; c-basic-offset: 4; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# 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/.
+
+XPIDL_SOURCES += [
+    'nsIBoxObject.idl',
+    'nsIBrowserBoxObject.idl',
+    'nsIContainerBoxObject.idl',
+    'nsIEditorBoxObject.idl',
+    'nsIIFrameBoxObject.idl',
+    'nsIListBoxObject.idl',
+    'nsIMenuBoxObject.idl',
+    'nsIPopupBoxObject.idl',
+    'nsIScrollBoxObject.idl',
+    'nsISliderListener.idl',
+]
+
+XPIDL_MODULE = 'layout_xul'
+
+EXPORTS += [
+    'nsIScrollbarMediator.h',
+    'nsPIBoxObject.h',
+    'nsXULPopupManager.h',
+]
+
diff --git a/layout/xul/nsIBoxObject.idl b/layout/xul/base/public/nsIBoxObject.idl
similarity index 100%
rename from layout/xul/nsIBoxObject.idl
rename to layout/xul/base/public/nsIBoxObject.idl
diff --git a/layout/xul/nsIBrowserBoxObject.idl b/layout/xul/base/public/nsIBrowserBoxObject.idl
similarity index 100%
rename from layout/xul/nsIBrowserBoxObject.idl
rename to layout/xul/base/public/nsIBrowserBoxObject.idl
diff --git a/layout/xul/nsIContainerBoxObject.idl b/layout/xul/base/public/nsIContainerBoxObject.idl
similarity index 100%
rename from layout/xul/nsIContainerBoxObject.idl
rename to layout/xul/base/public/nsIContainerBoxObject.idl
diff --git a/layout/xul/nsIEditorBoxObject.idl b/layout/xul/base/public/nsIEditorBoxObject.idl
similarity index 100%
rename from layout/xul/nsIEditorBoxObject.idl
rename to layout/xul/base/public/nsIEditorBoxObject.idl
diff --git a/layout/xul/nsIIFrameBoxObject.idl b/layout/xul/base/public/nsIIFrameBoxObject.idl
similarity index 100%
rename from layout/xul/nsIIFrameBoxObject.idl
rename to layout/xul/base/public/nsIIFrameBoxObject.idl
diff --git a/layout/xul/nsIListBoxObject.idl b/layout/xul/base/public/nsIListBoxObject.idl
similarity index 100%
rename from layout/xul/nsIListBoxObject.idl
rename to layout/xul/base/public/nsIListBoxObject.idl
diff --git a/layout/xul/nsIMenuBoxObject.idl b/layout/xul/base/public/nsIMenuBoxObject.idl
similarity index 100%
rename from layout/xul/nsIMenuBoxObject.idl
rename to layout/xul/base/public/nsIMenuBoxObject.idl
diff --git a/layout/xul/nsIPopupBoxObject.idl b/layout/xul/base/public/nsIPopupBoxObject.idl
similarity index 100%
rename from layout/xul/nsIPopupBoxObject.idl
rename to layout/xul/base/public/nsIPopupBoxObject.idl
diff --git a/layout/xul/nsIScrollBoxObject.idl b/layout/xul/base/public/nsIScrollBoxObject.idl
similarity index 100%
rename from layout/xul/nsIScrollBoxObject.idl
rename to layout/xul/base/public/nsIScrollBoxObject.idl
diff --git a/layout/xul/nsIScrollbarMediator.h b/layout/xul/base/public/nsIScrollbarMediator.h
similarity index 100%
rename from layout/xul/nsIScrollbarMediator.h
rename to layout/xul/base/public/nsIScrollbarMediator.h
diff --git a/layout/xul/nsISliderListener.idl b/layout/xul/base/public/nsISliderListener.idl
similarity index 100%
rename from layout/xul/nsISliderListener.idl
rename to layout/xul/base/public/nsISliderListener.idl
diff --git a/layout/xul/nsPIBoxObject.h b/layout/xul/base/public/nsPIBoxObject.h
similarity index 100%
rename from layout/xul/nsPIBoxObject.h
rename to layout/xul/base/public/nsPIBoxObject.h
diff --git a/layout/xul/nsXULPopupManager.h b/layout/xul/base/public/nsXULPopupManager.h
similarity index 100%
rename from layout/xul/nsXULPopupManager.h
rename to layout/xul/base/public/nsXULPopupManager.h
diff --git a/layout/xul/reftest/image-scaling-min-height-1-ref.xul b/layout/xul/base/reftest/image-scaling-min-height-1-ref.xul
similarity index 100%
rename from layout/xul/reftest/image-scaling-min-height-1-ref.xul
rename to layout/xul/base/reftest/image-scaling-min-height-1-ref.xul
diff --git a/layout/xul/reftest/image-scaling-min-height-1.xul b/layout/xul/base/reftest/image-scaling-min-height-1.xul
similarity index 100%
rename from layout/xul/reftest/image-scaling-min-height-1.xul
rename to layout/xul/base/reftest/image-scaling-min-height-1.xul
diff --git a/layout/xul/reftest/image-size-ref.xul b/layout/xul/base/reftest/image-size-ref.xul
similarity index 100%
rename from layout/xul/reftest/image-size-ref.xul
rename to layout/xul/base/reftest/image-size-ref.xul
diff --git a/layout/xul/reftest/image-size.xul b/layout/xul/base/reftest/image-size.xul
similarity index 100%
rename from layout/xul/reftest/image-size.xul
rename to layout/xul/base/reftest/image-size.xul
diff --git a/layout/xul/reftest/image4x3.png b/layout/xul/base/reftest/image4x3.png
similarity index 100%
rename from layout/xul/reftest/image4x3.png
rename to layout/xul/base/reftest/image4x3.png
diff --git a/layout/xul/reftest/popup-explicit-size-ref.xul b/layout/xul/base/reftest/popup-explicit-size-ref.xul
similarity index 100%
rename from layout/xul/reftest/popup-explicit-size-ref.xul
rename to layout/xul/base/reftest/popup-explicit-size-ref.xul
diff --git a/layout/xul/reftest/popup-explicit-size.xul b/layout/xul/base/reftest/popup-explicit-size.xul
similarity index 100%
rename from layout/xul/reftest/popup-explicit-size.xul
rename to layout/xul/base/reftest/popup-explicit-size.xul
diff --git a/layout/xul/reftest/reftest.list b/layout/xul/base/reftest/reftest.list
similarity index 100%
rename from layout/xul/reftest/reftest.list
rename to layout/xul/base/reftest/reftest.list
diff --git a/layout/xul/reftest/textbox-multiline-noresize.xul b/layout/xul/base/reftest/textbox-multiline-noresize.xul
similarity index 100%
rename from layout/xul/reftest/textbox-multiline-noresize.xul
rename to layout/xul/base/reftest/textbox-multiline-noresize.xul
diff --git a/layout/xul/reftest/textbox-multiline-ref.xul b/layout/xul/base/reftest/textbox-multiline-ref.xul
similarity index 100%
rename from layout/xul/reftest/textbox-multiline-ref.xul
rename to layout/xul/base/reftest/textbox-multiline-ref.xul
diff --git a/layout/xul/reftest/textbox-multiline-resize.xul b/layout/xul/base/reftest/textbox-multiline-resize.xul
similarity index 100%
rename from layout/xul/reftest/textbox-multiline-resize.xul
rename to layout/xul/base/reftest/textbox-multiline-resize.xul
diff --git a/layout/xul/crashtests/131008-1.xul b/layout/xul/base/src/crashtests/131008-1.xul
similarity index 100%
rename from layout/xul/crashtests/131008-1.xul
rename to layout/xul/base/src/crashtests/131008-1.xul
diff --git a/layout/xul/crashtests/137216-1.xul b/layout/xul/base/src/crashtests/137216-1.xul
similarity index 100%
rename from layout/xul/crashtests/137216-1.xul
rename to layout/xul/base/src/crashtests/137216-1.xul
diff --git a/layout/xul/crashtests/140218-1.xml b/layout/xul/base/src/crashtests/140218-1.xml
similarity index 100%
rename from layout/xul/crashtests/140218-1.xml
rename to layout/xul/base/src/crashtests/140218-1.xml
diff --git a/layout/xul/crashtests/151826-1.xul b/layout/xul/base/src/crashtests/151826-1.xul
similarity index 100%
rename from layout/xul/crashtests/151826-1.xul
rename to layout/xul/base/src/crashtests/151826-1.xul
diff --git a/layout/xul/crashtests/168724-1.xul b/layout/xul/base/src/crashtests/168724-1.xul
similarity index 100%
rename from layout/xul/crashtests/168724-1.xul
rename to layout/xul/base/src/crashtests/168724-1.xul
diff --git a/layout/xul/crashtests/189814-1.xul b/layout/xul/base/src/crashtests/189814-1.xul
similarity index 100%
rename from layout/xul/crashtests/189814-1.xul
rename to layout/xul/base/src/crashtests/189814-1.xul
diff --git a/layout/xul/crashtests/237787-1.xul b/layout/xul/base/src/crashtests/237787-1.xul
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diff --git a/layout/xul/crashtests/536931-1.xhtml b/layout/xul/base/src/crashtests/536931-1.xhtml
similarity index 100%
rename from layout/xul/crashtests/536931-1.xhtml
rename to layout/xul/base/src/crashtests/536931-1.xhtml
diff --git a/layout/xul/crashtests/538308-1.xul b/layout/xul/base/src/crashtests/538308-1.xul
similarity index 100%
rename from layout/xul/crashtests/538308-1.xul
rename to layout/xul/base/src/crashtests/538308-1.xul
diff --git a/layout/xul/crashtests/557174-1.xml b/layout/xul/base/src/crashtests/557174-1.xml
similarity index 100%
rename from layout/xul/crashtests/557174-1.xml
rename to layout/xul/base/src/crashtests/557174-1.xml
diff --git a/layout/xul/crashtests/564705-1.xul b/layout/xul/base/src/crashtests/564705-1.xul
similarity index 100%
rename from layout/xul/crashtests/564705-1.xul
rename to layout/xul/base/src/crashtests/564705-1.xul
diff --git a/layout/xul/crashtests/583957-1.html b/layout/xul/base/src/crashtests/583957-1.html
similarity index 100%
rename from layout/xul/crashtests/583957-1.html
rename to layout/xul/base/src/crashtests/583957-1.html
diff --git a/layout/xul/crashtests/crashtests.list b/layout/xul/base/src/crashtests/crashtests.list
similarity index 100%
rename from layout/xul/crashtests/crashtests.list
rename to layout/xul/base/src/crashtests/crashtests.list
diff --git a/layout/xul/crashtests/menulist-focused.xhtml b/layout/xul/base/src/crashtests/menulist-focused.xhtml
similarity index 100%
rename from layout/xul/crashtests/menulist-focused.xhtml
rename to layout/xul/base/src/crashtests/menulist-focused.xhtml
diff --git a/layout/xul/moz.build b/layout/xul/base/src/moz.build
similarity index 71%
rename from layout/xul/moz.build
rename to layout/xul/base/src/moz.build
index 2c9ff9a6e33a..a3fcbcf78ce6 100644
--- a/layout/xul/moz.build
+++ b/layout/xul/base/src/moz.build
@@ -4,27 +4,6 @@
 # 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/.
 
-XPIDL_SOURCES += [
-    'nsIBoxObject.idl',
-    'nsIBrowserBoxObject.idl',
-    'nsIContainerBoxObject.idl',
-    'nsIEditorBoxObject.idl',
-    'nsIIFrameBoxObject.idl',
-    'nsIListBoxObject.idl',
-    'nsIMenuBoxObject.idl',
-    'nsIPopupBoxObject.idl',
-    'nsIScrollBoxObject.idl',
-    'nsISliderListener.idl',
-]
-
-XPIDL_MODULE = 'layout_xul'
-
-EXPORTS += [
-    'nsIScrollbarMediator.h',
-    'nsPIBoxObject.h',
-    'nsXULPopupManager.h',
-]
-
 UNIFIED_SOURCES += [
     'nsBox.cpp',
     'nsBoxFrame.cpp',
@@ -73,24 +52,16 @@ if CONFIG['MOZ_XUL']:
         'nsXULPopupManager.cpp',
     ]
 
-if CONFIG['ENABLE_TESTS']:
-    PARALLEL_DIRS += [
-        'test',
-    ]
-
-if CONFIG['MOZ_XUL']:
-    PARALLEL_DIRS += ['tree', 'grid']
-
 FAIL_ON_WARNINGS = True
 
 MSVC_ENABLE_PGO = True
 
 FINAL_LIBRARY = 'gklayout'
 LOCAL_INCLUDES += [
-    '../../content/base/src',
-    '../../content/events/src',
-    '../base',
-    '../generic',
-    '../style',
+    '../../../../content/base/src',
+    '../../../../content/events/src',
+    '../../../base',
+    '../../../generic',
+    '../../../style',
 ]
 
diff --git a/layout/xul/nsBox.cpp b/layout/xul/base/src/nsBox.cpp
similarity index 100%
rename from layout/xul/nsBox.cpp
rename to layout/xul/base/src/nsBox.cpp
diff --git a/layout/xul/nsBox.h b/layout/xul/base/src/nsBox.h
similarity index 100%
rename from layout/xul/nsBox.h
rename to layout/xul/base/src/nsBox.h
diff --git a/layout/xul/nsBoxFrame.cpp b/layout/xul/base/src/nsBoxFrame.cpp
similarity index 100%
rename from layout/xul/nsBoxFrame.cpp
rename to layout/xul/base/src/nsBoxFrame.cpp
diff --git a/layout/xul/nsBoxFrame.h b/layout/xul/base/src/nsBoxFrame.h
similarity index 100%
rename from layout/xul/nsBoxFrame.h
rename to layout/xul/base/src/nsBoxFrame.h
diff --git a/layout/xul/nsBoxLayout.cpp b/layout/xul/base/src/nsBoxLayout.cpp
similarity index 100%
rename from layout/xul/nsBoxLayout.cpp
rename to layout/xul/base/src/nsBoxLayout.cpp
diff --git a/layout/xul/nsBoxLayout.h b/layout/xul/base/src/nsBoxLayout.h
similarity index 100%
rename from layout/xul/nsBoxLayout.h
rename to layout/xul/base/src/nsBoxLayout.h
diff --git a/layout/xul/nsBoxLayoutState.cpp b/layout/xul/base/src/nsBoxLayoutState.cpp
similarity index 100%
rename from layout/xul/nsBoxLayoutState.cpp
rename to layout/xul/base/src/nsBoxLayoutState.cpp
diff --git a/layout/xul/nsBoxLayoutState.h b/layout/xul/base/src/nsBoxLayoutState.h
similarity index 100%
rename from layout/xul/nsBoxLayoutState.h
rename to layout/xul/base/src/nsBoxLayoutState.h
diff --git a/layout/xul/nsBoxObject.cpp b/layout/xul/base/src/nsBoxObject.cpp
similarity index 100%
rename from layout/xul/nsBoxObject.cpp
rename to layout/xul/base/src/nsBoxObject.cpp
diff --git a/layout/xul/nsBoxObject.h b/layout/xul/base/src/nsBoxObject.h
similarity index 100%
rename from layout/xul/nsBoxObject.h
rename to layout/xul/base/src/nsBoxObject.h
diff --git a/layout/xul/nsButtonBoxFrame.cpp b/layout/xul/base/src/nsButtonBoxFrame.cpp
similarity index 100%
rename from layout/xul/nsButtonBoxFrame.cpp
rename to layout/xul/base/src/nsButtonBoxFrame.cpp
diff --git a/layout/xul/nsButtonBoxFrame.h b/layout/xul/base/src/nsButtonBoxFrame.h
similarity index 100%
rename from layout/xul/nsButtonBoxFrame.h
rename to layout/xul/base/src/nsButtonBoxFrame.h
diff --git a/layout/xul/nsContainerBoxObject.cpp b/layout/xul/base/src/nsContainerBoxObject.cpp
similarity index 100%
rename from layout/xul/nsContainerBoxObject.cpp
rename to layout/xul/base/src/nsContainerBoxObject.cpp
diff --git a/layout/xul/nsDeckFrame.cpp b/layout/xul/base/src/nsDeckFrame.cpp
similarity index 100%
rename from layout/xul/nsDeckFrame.cpp
rename to layout/xul/base/src/nsDeckFrame.cpp
diff --git a/layout/xul/nsDeckFrame.h b/layout/xul/base/src/nsDeckFrame.h
similarity index 100%
rename from layout/xul/nsDeckFrame.h
rename to layout/xul/base/src/nsDeckFrame.h
diff --git a/layout/xul/nsDocElementBoxFrame.cpp b/layout/xul/base/src/nsDocElementBoxFrame.cpp
similarity index 100%
rename from layout/xul/nsDocElementBoxFrame.cpp
rename to layout/xul/base/src/nsDocElementBoxFrame.cpp
diff --git a/layout/xul/nsGroupBoxFrame.cpp b/layout/xul/base/src/nsGroupBoxFrame.cpp
similarity index 100%
rename from layout/xul/nsGroupBoxFrame.cpp
rename to layout/xul/base/src/nsGroupBoxFrame.cpp
diff --git a/layout/xul/nsIRootBox.h b/layout/xul/base/src/nsIRootBox.h
similarity index 100%
rename from layout/xul/nsIRootBox.h
rename to layout/xul/base/src/nsIRootBox.h
diff --git a/layout/xul/nsImageBoxFrame.cpp b/layout/xul/base/src/nsImageBoxFrame.cpp
similarity index 100%
rename from layout/xul/nsImageBoxFrame.cpp
rename to layout/xul/base/src/nsImageBoxFrame.cpp
diff --git a/layout/xul/nsImageBoxFrame.h b/layout/xul/base/src/nsImageBoxFrame.h
similarity index 100%
rename from layout/xul/nsImageBoxFrame.h
rename to layout/xul/base/src/nsImageBoxFrame.h
diff --git a/layout/xul/nsLeafBoxFrame.cpp b/layout/xul/base/src/nsLeafBoxFrame.cpp
similarity index 100%
rename from layout/xul/nsLeafBoxFrame.cpp
rename to layout/xul/base/src/nsLeafBoxFrame.cpp
diff --git a/layout/xul/nsLeafBoxFrame.h b/layout/xul/base/src/nsLeafBoxFrame.h
similarity index 100%
rename from layout/xul/nsLeafBoxFrame.h
rename to layout/xul/base/src/nsLeafBoxFrame.h
diff --git a/layout/xul/nsListBoxBodyFrame.cpp b/layout/xul/base/src/nsListBoxBodyFrame.cpp
similarity index 100%
rename from layout/xul/nsListBoxBodyFrame.cpp
rename to layout/xul/base/src/nsListBoxBodyFrame.cpp
diff --git a/layout/xul/nsListBoxBodyFrame.h b/layout/xul/base/src/nsListBoxBodyFrame.h
similarity index 100%
rename from layout/xul/nsListBoxBodyFrame.h
rename to layout/xul/base/src/nsListBoxBodyFrame.h
diff --git a/layout/xul/nsListBoxLayout.cpp b/layout/xul/base/src/nsListBoxLayout.cpp
similarity index 100%
rename from layout/xul/nsListBoxLayout.cpp
rename to layout/xul/base/src/nsListBoxLayout.cpp
diff --git a/layout/xul/nsListBoxLayout.h b/layout/xul/base/src/nsListBoxLayout.h
similarity index 100%
rename from layout/xul/nsListBoxLayout.h
rename to layout/xul/base/src/nsListBoxLayout.h
diff --git a/layout/xul/nsListBoxObject.cpp b/layout/xul/base/src/nsListBoxObject.cpp
similarity index 100%
rename from layout/xul/nsListBoxObject.cpp
rename to layout/xul/base/src/nsListBoxObject.cpp
diff --git a/layout/xul/nsListItemFrame.cpp b/layout/xul/base/src/nsListItemFrame.cpp
similarity index 100%
rename from layout/xul/nsListItemFrame.cpp
rename to layout/xul/base/src/nsListItemFrame.cpp
diff --git a/layout/xul/nsListItemFrame.h b/layout/xul/base/src/nsListItemFrame.h
similarity index 100%
rename from layout/xul/nsListItemFrame.h
rename to layout/xul/base/src/nsListItemFrame.h
diff --git a/layout/xul/nsMenuBarFrame.cpp b/layout/xul/base/src/nsMenuBarFrame.cpp
similarity index 100%
rename from layout/xul/nsMenuBarFrame.cpp
rename to layout/xul/base/src/nsMenuBarFrame.cpp
diff --git a/layout/xul/nsMenuBarFrame.h b/layout/xul/base/src/nsMenuBarFrame.h
similarity index 100%
rename from layout/xul/nsMenuBarFrame.h
rename to layout/xul/base/src/nsMenuBarFrame.h
diff --git a/layout/xul/nsMenuBarListener.cpp b/layout/xul/base/src/nsMenuBarListener.cpp
similarity index 100%
rename from layout/xul/nsMenuBarListener.cpp
rename to layout/xul/base/src/nsMenuBarListener.cpp
diff --git a/layout/xul/nsMenuBarListener.h b/layout/xul/base/src/nsMenuBarListener.h
similarity index 100%
rename from layout/xul/nsMenuBarListener.h
rename to layout/xul/base/src/nsMenuBarListener.h
diff --git a/layout/xul/nsMenuBoxObject.cpp b/layout/xul/base/src/nsMenuBoxObject.cpp
similarity index 100%
rename from layout/xul/nsMenuBoxObject.cpp
rename to layout/xul/base/src/nsMenuBoxObject.cpp
diff --git a/layout/xul/nsMenuFrame.cpp b/layout/xul/base/src/nsMenuFrame.cpp
similarity index 100%
rename from layout/xul/nsMenuFrame.cpp
rename to layout/xul/base/src/nsMenuFrame.cpp
diff --git a/layout/xul/nsMenuFrame.h b/layout/xul/base/src/nsMenuFrame.h
similarity index 100%
rename from layout/xul/nsMenuFrame.h
rename to layout/xul/base/src/nsMenuFrame.h
diff --git a/layout/xul/nsMenuParent.h b/layout/xul/base/src/nsMenuParent.h
similarity index 100%
rename from layout/xul/nsMenuParent.h
rename to layout/xul/base/src/nsMenuParent.h
diff --git a/layout/xul/nsMenuPopupFrame.cpp b/layout/xul/base/src/nsMenuPopupFrame.cpp
similarity index 100%
rename from layout/xul/nsMenuPopupFrame.cpp
rename to layout/xul/base/src/nsMenuPopupFrame.cpp
diff --git a/layout/xul/nsMenuPopupFrame.h b/layout/xul/base/src/nsMenuPopupFrame.h
similarity index 100%
rename from layout/xul/nsMenuPopupFrame.h
rename to layout/xul/base/src/nsMenuPopupFrame.h
diff --git a/layout/xul/nsPIListBoxObject.h b/layout/xul/base/src/nsPIListBoxObject.h
similarity index 100%
rename from layout/xul/nsPIListBoxObject.h
rename to layout/xul/base/src/nsPIListBoxObject.h
diff --git a/layout/xul/nsPopupBoxObject.cpp b/layout/xul/base/src/nsPopupBoxObject.cpp
similarity index 100%
rename from layout/xul/nsPopupBoxObject.cpp
rename to layout/xul/base/src/nsPopupBoxObject.cpp
diff --git a/layout/xul/nsPopupSetFrame.cpp b/layout/xul/base/src/nsPopupSetFrame.cpp
similarity index 100%
rename from layout/xul/nsPopupSetFrame.cpp
rename to layout/xul/base/src/nsPopupSetFrame.cpp
diff --git a/layout/xul/nsPopupSetFrame.h b/layout/xul/base/src/nsPopupSetFrame.h
similarity index 100%
rename from layout/xul/nsPopupSetFrame.h
rename to layout/xul/base/src/nsPopupSetFrame.h
diff --git a/layout/xul/nsProgressMeterFrame.cpp b/layout/xul/base/src/nsProgressMeterFrame.cpp
similarity index 100%
rename from layout/xul/nsProgressMeterFrame.cpp
rename to layout/xul/base/src/nsProgressMeterFrame.cpp
diff --git a/layout/xul/nsProgressMeterFrame.h b/layout/xul/base/src/nsProgressMeterFrame.h
similarity index 100%
rename from layout/xul/nsProgressMeterFrame.h
rename to layout/xul/base/src/nsProgressMeterFrame.h
diff --git a/layout/xul/nsRepeatService.cpp b/layout/xul/base/src/nsRepeatService.cpp
similarity index 100%
rename from layout/xul/nsRepeatService.cpp
rename to layout/xul/base/src/nsRepeatService.cpp
diff --git a/layout/xul/nsRepeatService.h b/layout/xul/base/src/nsRepeatService.h
similarity index 100%
rename from layout/xul/nsRepeatService.h
rename to layout/xul/base/src/nsRepeatService.h
diff --git a/layout/xul/nsResizerFrame.cpp b/layout/xul/base/src/nsResizerFrame.cpp
similarity index 100%
rename from layout/xul/nsResizerFrame.cpp
rename to layout/xul/base/src/nsResizerFrame.cpp
diff --git a/layout/xul/nsResizerFrame.h b/layout/xul/base/src/nsResizerFrame.h
similarity index 100%
rename from layout/xul/nsResizerFrame.h
rename to layout/xul/base/src/nsResizerFrame.h
diff --git a/layout/xul/nsRootBoxFrame.cpp b/layout/xul/base/src/nsRootBoxFrame.cpp
similarity index 100%
rename from layout/xul/nsRootBoxFrame.cpp
rename to layout/xul/base/src/nsRootBoxFrame.cpp
diff --git a/layout/xul/nsScrollBoxFrame.cpp b/layout/xul/base/src/nsScrollBoxFrame.cpp
similarity index 100%
rename from layout/xul/nsScrollBoxFrame.cpp
rename to layout/xul/base/src/nsScrollBoxFrame.cpp
diff --git a/layout/xul/nsScrollBoxObject.cpp b/layout/xul/base/src/nsScrollBoxObject.cpp
similarity index 100%
rename from layout/xul/nsScrollBoxObject.cpp
rename to layout/xul/base/src/nsScrollBoxObject.cpp
diff --git a/layout/xul/nsScrollbarButtonFrame.cpp b/layout/xul/base/src/nsScrollbarButtonFrame.cpp
similarity index 100%
rename from layout/xul/nsScrollbarButtonFrame.cpp
rename to layout/xul/base/src/nsScrollbarButtonFrame.cpp
diff --git a/layout/xul/nsScrollbarButtonFrame.h b/layout/xul/base/src/nsScrollbarButtonFrame.h
similarity index 100%
rename from layout/xul/nsScrollbarButtonFrame.h
rename to layout/xul/base/src/nsScrollbarButtonFrame.h
diff --git a/layout/xul/nsScrollbarFrame.cpp b/layout/xul/base/src/nsScrollbarFrame.cpp
similarity index 100%
rename from layout/xul/nsScrollbarFrame.cpp
rename to layout/xul/base/src/nsScrollbarFrame.cpp
diff --git a/layout/xul/nsScrollbarFrame.h b/layout/xul/base/src/nsScrollbarFrame.h
similarity index 100%
rename from layout/xul/nsScrollbarFrame.h
rename to layout/xul/base/src/nsScrollbarFrame.h
diff --git a/layout/xul/nsSliderFrame.cpp b/layout/xul/base/src/nsSliderFrame.cpp
similarity index 100%
rename from layout/xul/nsSliderFrame.cpp
rename to layout/xul/base/src/nsSliderFrame.cpp
diff --git a/layout/xul/nsSliderFrame.h b/layout/xul/base/src/nsSliderFrame.h
similarity index 100%
rename from layout/xul/nsSliderFrame.h
rename to layout/xul/base/src/nsSliderFrame.h
diff --git a/layout/xul/nsSplitterFrame.cpp b/layout/xul/base/src/nsSplitterFrame.cpp
similarity index 100%
rename from layout/xul/nsSplitterFrame.cpp
rename to layout/xul/base/src/nsSplitterFrame.cpp
diff --git a/layout/xul/nsSplitterFrame.h b/layout/xul/base/src/nsSplitterFrame.h
similarity index 100%
rename from layout/xul/nsSplitterFrame.h
rename to layout/xul/base/src/nsSplitterFrame.h
diff --git a/layout/xul/nsSprocketLayout.cpp b/layout/xul/base/src/nsSprocketLayout.cpp
similarity index 100%
rename from layout/xul/nsSprocketLayout.cpp
rename to layout/xul/base/src/nsSprocketLayout.cpp
diff --git a/layout/xul/nsSprocketLayout.h b/layout/xul/base/src/nsSprocketLayout.h
similarity index 100%
rename from layout/xul/nsSprocketLayout.h
rename to layout/xul/base/src/nsSprocketLayout.h
diff --git a/layout/xul/nsStackFrame.cpp b/layout/xul/base/src/nsStackFrame.cpp
similarity index 100%
rename from layout/xul/nsStackFrame.cpp
rename to layout/xul/base/src/nsStackFrame.cpp
diff --git a/layout/xul/nsStackFrame.h b/layout/xul/base/src/nsStackFrame.h
similarity index 100%
rename from layout/xul/nsStackFrame.h
rename to layout/xul/base/src/nsStackFrame.h
diff --git a/layout/xul/nsStackLayout.cpp b/layout/xul/base/src/nsStackLayout.cpp
similarity index 100%
rename from layout/xul/nsStackLayout.cpp
rename to layout/xul/base/src/nsStackLayout.cpp
diff --git a/layout/xul/nsStackLayout.h b/layout/xul/base/src/nsStackLayout.h
similarity index 100%
rename from layout/xul/nsStackLayout.h
rename to layout/xul/base/src/nsStackLayout.h
diff --git a/layout/xul/nsTextBoxFrame.cpp b/layout/xul/base/src/nsTextBoxFrame.cpp
similarity index 100%
rename from layout/xul/nsTextBoxFrame.cpp
rename to layout/xul/base/src/nsTextBoxFrame.cpp
diff --git a/layout/xul/nsTextBoxFrame.h b/layout/xul/base/src/nsTextBoxFrame.h
similarity index 100%
rename from layout/xul/nsTextBoxFrame.h
rename to layout/xul/base/src/nsTextBoxFrame.h
diff --git a/layout/xul/nsTitleBarFrame.cpp b/layout/xul/base/src/nsTitleBarFrame.cpp
similarity index 100%
rename from layout/xul/nsTitleBarFrame.cpp
rename to layout/xul/base/src/nsTitleBarFrame.cpp
diff --git a/layout/xul/nsTitleBarFrame.h b/layout/xul/base/src/nsTitleBarFrame.h
similarity index 100%
rename from layout/xul/nsTitleBarFrame.h
rename to layout/xul/base/src/nsTitleBarFrame.h
diff --git a/layout/xul/nsXULLabelFrame.cpp b/layout/xul/base/src/nsXULLabelFrame.cpp
similarity index 100%
rename from layout/xul/nsXULLabelFrame.cpp
rename to layout/xul/base/src/nsXULLabelFrame.cpp
diff --git a/layout/xul/nsXULLabelFrame.h b/layout/xul/base/src/nsXULLabelFrame.h
similarity index 100%
rename from layout/xul/nsXULLabelFrame.h
rename to layout/xul/base/src/nsXULLabelFrame.h
diff --git a/layout/xul/nsXULPopupManager.cpp b/layout/xul/base/src/nsXULPopupManager.cpp
similarity index 100%
rename from layout/xul/nsXULPopupManager.cpp
rename to layout/xul/base/src/nsXULPopupManager.cpp
diff --git a/layout/xul/nsXULTooltipListener.cpp b/layout/xul/base/src/nsXULTooltipListener.cpp
similarity index 100%
rename from layout/xul/nsXULTooltipListener.cpp
rename to layout/xul/base/src/nsXULTooltipListener.cpp
diff --git a/layout/xul/nsXULTooltipListener.h b/layout/xul/base/src/nsXULTooltipListener.h
similarity index 100%
rename from layout/xul/nsXULTooltipListener.h
rename to layout/xul/base/src/nsXULTooltipListener.h
diff --git a/layout/xul/base/test/chrome.ini b/layout/xul/base/test/chrome.ini
new file mode 100644
index 000000000000..88dbfbc00730
--- /dev/null
+++ b/layout/xul/base/test/chrome.ini
@@ -0,0 +1,12 @@
+[DEFAULT]
+support-files =
+  window_resizer.xul
+  window_resizer_element.xul
+
+[test_bug381167.xhtml]
+[test_bug393970.xul]
+[test_bug477754.xul]
+[test_popupSizeTo.xul]
+[test_resizer.xul]
+[test_stack.xul]
+[test_windowminmaxsize.xul]
diff --git a/layout/xul/base/test/mochitest.ini b/layout/xul/base/test/mochitest.ini
new file mode 100644
index 000000000000..29cba1c1a9de
--- /dev/null
+++ b/layout/xul/base/test/mochitest.ini
@@ -0,0 +1,5 @@
+[DEFAULT]
+
+[test_bug511075.html]
+[test_resizer_incontent.xul]
+[test_splitter.xul]
diff --git a/layout/xul/base/test/moz.build b/layout/xul/base/test/moz.build
new file mode 100644
index 000000000000..99b068bc92a0
--- /dev/null
+++ b/layout/xul/base/test/moz.build
@@ -0,0 +1,10 @@
+# -*- Mode: python; c-basic-offset: 4; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# 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/.
+
+MOCHITEST_MANIFESTS += ['mochitest.ini']
+
+MOCHITEST_CHROME_MANIFESTS += ['chrome.ini']
+
diff --git a/layout/xul/test/test_bug381167.xhtml b/layout/xul/base/test/test_bug381167.xhtml
similarity index 100%
rename from layout/xul/test/test_bug381167.xhtml
rename to layout/xul/base/test/test_bug381167.xhtml
diff --git a/layout/xul/test/test_bug393970.xul b/layout/xul/base/test/test_bug393970.xul
similarity index 100%
rename from layout/xul/test/test_bug393970.xul
rename to layout/xul/base/test/test_bug393970.xul
diff --git a/layout/xul/test/test_bug477754.xul b/layout/xul/base/test/test_bug477754.xul
similarity index 100%
rename from layout/xul/test/test_bug477754.xul
rename to layout/xul/base/test/test_bug477754.xul
diff --git a/layout/xul/test/test_bug511075.html b/layout/xul/base/test/test_bug511075.html
similarity index 100%
rename from layout/xul/test/test_bug511075.html
rename to layout/xul/base/test/test_bug511075.html
diff --git a/layout/xul/test/test_popupSizeTo.xul b/layout/xul/base/test/test_popupSizeTo.xul
similarity index 100%
rename from layout/xul/test/test_popupSizeTo.xul
rename to layout/xul/base/test/test_popupSizeTo.xul
diff --git a/layout/xul/test/test_resizer.xul b/layout/xul/base/test/test_resizer.xul
similarity index 100%
rename from layout/xul/test/test_resizer.xul
rename to layout/xul/base/test/test_resizer.xul
diff --git a/layout/xul/test/test_resizer_incontent.xul b/layout/xul/base/test/test_resizer_incontent.xul
similarity index 100%
rename from layout/xul/test/test_resizer_incontent.xul
rename to layout/xul/base/test/test_resizer_incontent.xul
diff --git a/layout/xul/test/test_splitter.xul b/layout/xul/base/test/test_splitter.xul
similarity index 100%
rename from layout/xul/test/test_splitter.xul
rename to layout/xul/base/test/test_splitter.xul
diff --git a/layout/xul/test/test_stack.xul b/layout/xul/base/test/test_stack.xul
similarity index 100%
rename from layout/xul/test/test_stack.xul
rename to layout/xul/base/test/test_stack.xul
diff --git a/layout/xul/test/test_windowminmaxsize.xul b/layout/xul/base/test/test_windowminmaxsize.xul
similarity index 100%
rename from layout/xul/test/test_windowminmaxsize.xul
rename to layout/xul/base/test/test_windowminmaxsize.xul
diff --git a/layout/xul/test/window_resizer.xul b/layout/xul/base/test/window_resizer.xul
similarity index 100%
rename from layout/xul/test/window_resizer.xul
rename to layout/xul/base/test/window_resizer.xul
diff --git a/layout/xul/test/window_resizer_element.xul b/layout/xul/base/test/window_resizer_element.xul
similarity index 100%
rename from layout/xul/test/window_resizer_element.xul
rename to layout/xul/base/test/window_resizer_element.xul
diff --git a/layout/xul/grid/moz.build b/layout/xul/grid/moz.build
index 90e6b7ba8504..379368f4a1cc 100644
--- a/layout/xul/grid/moz.build
+++ b/layout/xul/grid/moz.build
@@ -32,9 +32,9 @@ FAIL_ON_WARNINGS = True
 
 FINAL_LIBRARY = 'gklayout'
 LOCAL_INCLUDES += [
-    '..',
     '../../forms',
     '../../generic',
     '../../style',
+    '../base/src',
 ]
 
diff --git a/layout/xul/test/chrome.ini b/layout/xul/test/chrome.ini
index 4c438eef59f1..af3adfbbd84b 100644
--- a/layout/xul/test/chrome.ini
+++ b/layout/xul/test/chrome.ini
@@ -1,17 +1,7 @@
 [DEFAULT]
-support-files =
-  window_resizer.xul
-  window_resizer_element.xul
 
 [test_bug159346.xul]
 [test_bug372685.xul]
-[test_bug381167.xhtml]
-[test_bug393970.xul]
 [test_bug398982-1.xul]
 [test_bug398982-2.xul]
-[test_bug477754.xul]
 [test_bug703150.xul]
-[test_popupSizeTo.xul]
-[test_resizer.xul]
-[test_stack.xul]
-[test_windowminmaxsize.xul]
diff --git a/layout/xul/test/mochitest.ini b/layout/xul/test/mochitest.ini
index 840428a31e6d..483cdaa93ee9 100644
--- a/layout/xul/test/mochitest.ini
+++ b/layout/xul/test/mochitest.ini
@@ -2,7 +2,4 @@
 
 [test_bug386386.html]
 [test_bug394800.xhtml]
-[test_bug511075.html]
 [test_bug563416.html]
-[test_resizer_incontent.xul]
-[test_splitter.xul]
diff --git a/layout/xul/tree/moz.build b/layout/xul/tree/moz.build
index 920a4e6417ad..820c5ad68b0c 100644
--- a/layout/xul/tree/moz.build
+++ b/layout/xul/tree/moz.build
@@ -35,11 +35,11 @@ FAIL_ON_WARNINGS = True
 
 FINAL_LIBRARY = 'gklayout'
 LOCAL_INCLUDES += [
-    '..',
     '../../base',
     '../../forms',
     '../../generic',
     '../../style',
+    '../base/src',
     '/content/base/src',
     '/content/events/src',
 ]
diff --git a/testing/crashtest/crashtests.list b/testing/crashtest/crashtests.list
index 62c6768c1028..01739ab7bd51 100644
--- a/testing/crashtest/crashtests.list
+++ b/testing/crashtest/crashtests.list
@@ -51,7 +51,7 @@ include ../../layout/mathml/crashtests/crashtests.list
 include ../../layout/style/crashtests/crashtests.list
 include ../../layout/svg/crashtests/crashtests.list
 include ../../layout/tables/crashtests/crashtests.list
-include ../../layout/xul/crashtests/crashtests.list
+include ../../layout/xul/base/src/crashtests/crashtests.list
 include ../../layout/xul/grid/crashtests/crashtests.list
 include ../../layout/xul/tree/crashtests/crashtests.list
 
diff --git a/widget/cocoa/moz.build b/widget/cocoa/moz.build
index a7b69e2bdba4..bd4caa5fd447 100644
--- a/widget/cocoa/moz.build
+++ b/widget/cocoa/moz.build
@@ -75,6 +75,6 @@ LOCAL_INCLUDES += [
     '../xpwidgets',
     '/layout/forms',
     '/layout/generic',
-    '/layout/xul',
+    '/layout/xul/base/src',
 ]
 
diff --git a/widget/gtk/moz.build b/widget/gtk/moz.build
index 762bc463f0be..ce77d007fc4b 100644
--- a/widget/gtk/moz.build
+++ b/widget/gtk/moz.build
@@ -85,7 +85,7 @@ LOCAL_INCLUDES += [
     '../shared',
     '../xpwidgets',
     '/layout/generic',
-    '/layout/xul',
+    '/layout/xul/base/src',
     '/other-licenses/atk-1.0',
 ]
 
diff --git a/widget/windows/moz.build b/widget/windows/moz.build
index 5d1faeb04e40..08d0ab31439e 100644
--- a/widget/windows/moz.build
+++ b/widget/windows/moz.build
@@ -94,7 +94,7 @@ LOCAL_INCLUDES += [
     '../xpwidgets',
     '/content/events/src',
     '/layout/generic',
-    '/layout/xul',
+    '/layout/xul/base/src',
     '/toolkit/xre',
     '/xpcom/base',
 ]
diff --git a/widget/windows/winrt/moz.build b/widget/windows/winrt/moz.build
index 41273d8cd39d..4d2ea98e33e0 100644
--- a/widget/windows/winrt/moz.build
+++ b/widget/windows/winrt/moz.build
@@ -34,7 +34,7 @@ LOCAL_INCLUDES += [
     '../../shared',
     '../../xpwidgets',
     '/layout/generic',
-    '/layout/xul',
+    '/layout/xul/base/src',
     '/toolkit/xre',
     '/xpcom/base',
 ]
diff --git a/widget/xpwidgets/moz.build b/widget/xpwidgets/moz.build
index ad66c3c5b965..691fdd7e0139 100644
--- a/widget/xpwidgets/moz.build
+++ b/widget/xpwidgets/moz.build
@@ -74,7 +74,7 @@ LOCAL_INCLUDES += [
     '/layout/base',
     '/layout/forms',
     '/layout/generic',
-    '/layout/xul',
+    '/layout/xul/base/src',
     '/view/src',
 ]