--- a/layout/base/moz.build
+++ b/layout/base/moz.build
@@ -1,14 +1,16 @@
 # -*- 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/.
 
+# Here are some edits
+
 with Files('ActiveLayerTracker.*'):
     BUG_COMPONENT = ('Core', 'Layout: View Rendering')
 
 with Files('Display*'):
     BUG_COMPONENT = ('Core', 'Layout: View Rendering')
 
 with Files('FrameLayerBuilder.*'):
     BUG_COMPONENT = ('Core', 'Layout: View Rendering')

--- a/layout/moz.build
+++ b/layout/moz.build
@@ -1,14 +1,17 @@
 # -*- 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/.
 
+# Here are some sample edits to this file.
+# Edit edit edit.
+
 with Files('**'):
     BUG_COMPONENT = ('Core', 'Layout')
 
 DIRS += [
     'style',
     'base',
     'generic',
     'forms',

--- a/layout/svg/moz.build
+++ b/layout/svg/moz.build
@@ -1,14 +1,16 @@
 # -*- 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/.
 
+# Edits edits edits.
+
 with Files('**'):
     BUG_COMPONENT = ('Core', 'SVG')
 
 EXPORTS += [
     'nsFilterInstance.h',
     'nsSVGEffects.h',
     'nsSVGFilterInstance.h',
     'nsSVGForeignObjectFrame.h',

--- a/layout/tables/moz.build
+++ b/layout/tables/moz.build
@@ -1,14 +1,16 @@
 # -*- 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/.
 
+# Sample edits to this file now.
+
 with Files('**'):
     BUG_COMPONENT = ('Core', 'Layout: Tables')
 
 MOCHITEST_MANIFESTS += ['test/mochitest.ini']
 
 EXPORTS += [
     'nsITableCellLayout.h',
 ]