--- a/gfx/2d/moz.build
+++ b/gfx/2d/moz.build
@@ -103,17 +103,15 @@ SOURCES += [
 if CONFIG['MOZ_WIDGET_TOOLKIT'] == 'cocoa':
     SOURCES += [
         'MacIOSurface.cpp',
         'QuartzSupport.mm',
     ]
 
 FAIL_ON_WARNINGS = True
 
-LIBXUL_LIBRARY = True
-
 MSVC_ENABLE_PGO = True
 
 LIBRARY_NAME = 'gfx2d'
 
 include('/ipc/chromium/chromium-config.mozbuild')
 
 FINAL_LIBRARY = 'gkmedias'

--- a/gfx/angle/moz.build
+++ b/gfx/angle/moz.build
@@ -114,15 +114,14 @@ UNIFIED_SOURCES += ['src/compiler/' + sr
     'OutputGLSLBase.cpp',
     'ShaderLang.cpp',
     'TranslatorESSL.cpp',
     'TranslatorGLSL.cpp',
     'VersionGLSL.cpp',
 ]]
 
 LIBRARY_NAME = 'angle'
-LIBXUL_LIBRARY = True
 MSVC_ENABLE_PGO = True
 
 if CONFIG['OS_TARGET'] == 'WINNT':
     NO_VISIBILITY_FLAGS = True
 
 FINAL_LIBRARY = 'gkmedias'

--- a/gfx/cairo/cairo/src/moz.build
+++ b/gfx/cairo/cairo/src/moz.build
@@ -109,18 +109,16 @@ if CONFIG['MOZ_ENABLE_CAIRO_FT']:
     ]
     SOURCES += [
         'cairo-ft-font.c',
         'cairo-type1-subset.c',
     ]
 
 LIBRARY_NAME = 'mozcairo'
 
-LIBXUL_LIBRARY = True
-
 SOURCES += [
     'cairo-analysis-surface.c',
     'cairo-arc.c',
     'cairo-array.c',
     'cairo-atomic.c',
     'cairo-base64-stream.c',
     'cairo-bentley-ottmann-rectangular.c',
     'cairo-bentley-ottmann-rectilinear.c',

--- a/gfx/cairo/libpixman/src/moz.build
+++ b/gfx/cairo/libpixman/src/moz.build
@@ -20,18 +20,16 @@ if CONFIG['OS_ARCH'] != 'Darwin' and CON
             'pixman-arm-neon-asm.S',
         ]
     if CONFIG['HAVE_ARM_SIMD']:
         SOURCES += [
             'pixman-arm-simd-asm-scaled.S',
             'pixman-arm-simd-asm.S',
         ]
 
-LIBXUL_LIBRARY = True
-
 SOURCES += [
     'pixman-access-accessors.c',
     'pixman-access.c',
     'pixman-arm.c',
     'pixman-bits-image.c',
     'pixman-combine-float.c',
     'pixman-combine16.c',
     'pixman-combine32.c',

--- a/gfx/graphite2/src/moz.build
+++ b/gfx/graphite2/src/moz.build
@@ -1,17 +1,14 @@
 # -*- 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/.
 
-if CONFIG['OS_TARGET'] != 'WINNT':
-    LIBXUL_LIBRARY = True
-
 # This should contain all of the _PUBLIC_HEADERS from files.mk
 EXPORTS.graphite2 += [
     '../include/graphite2/Font.h',
     '../include/graphite2/Log.h',
     '../include/graphite2/Segment.h',
     '../include/graphite2/Types.h',
 ]
 

--- a/gfx/harfbuzz/src/moz.build
+++ b/gfx/harfbuzz/src/moz.build
@@ -1,17 +1,14 @@
 # -*- 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/.
 
-if CONFIG['OS_ARCH'] != 'WINNT':
-    LIBXUL_LIBRARY = True
-
 EXPORTS.harfbuzz += [
     'hb-blob.h',
     'hb-buffer.h',
     'hb-common.h',
     'hb-deprecated.h',
     'hb-face.h',
     'hb-font.h',
     'hb-ot-layout.h',

--- a/gfx/ots/src/moz.build
+++ b/gfx/ots/src/moz.build
@@ -1,17 +1,14 @@
 # -*- 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/.
 
-if CONFIG['OS_TARGET'] != 'WINNT':
-    LIBXUL_LIBRARY = True
-
 EXPORTS += [
     '../include/opentype-sanitiser.h',
     '../include/ots-memory-stream.h',
 ]
 
 SOURCES += [
     'cff.cc',
     'cff_type2_charstring.cc',

--- a/gfx/qcms/moz.build
+++ b/gfx/qcms/moz.build
@@ -6,18 +6,16 @@
 
 EXPORTS += [
     'qcms.h',
     'qcmstypes.h',
 ]
 
 LIBRARY_NAME = 'mozqcms'
 
-LIBXUL_LIBRARY = True
-
 SOURCES += [
     'chain.c',
     'iccread.c',
     'matrix.c',
     'transform.c',
     'transform_util.c',
 ]
 

--- a/gfx/skia/moz.build
+++ b/gfx/skia/moz.build
@@ -580,13 +580,11 @@ else:
 # left out of UNIFIED_SOURCES for now; that's not C++ anyway, nothing else to unify it with
 if not CONFIG['INTEL_ARCHITECTURE'] and CONFIG['CPU_ARCH'] == 'arm' and CONFIG['GNU_CC']:
     SOURCES += [
         'src/opts/memset.arm.S',
     ]
 
 LIBRARY_NAME = 'skia'
 
-LIBXUL_LIBRARY = True
-
 MSVC_ENABLE_PGO = True
 
 FINAL_LIBRARY = 'gkmedias'