--- a/browser/app/profile/firefox.js
+++ b/browser/app/profile/firefox.js
@@ -416,21 +416,17 @@ pref("browser.tabs.warnOnCloseOtherTabs"
 pref("browser.tabs.warnOnOpen", true);
 pref("browser.tabs.maxOpenBeforeWarn", 15);
 pref("browser.tabs.loadInBackground", true);
 pref("browser.tabs.opentabfor.middleclick", true);
 pref("browser.tabs.loadDivertedInBackground", false);
 pref("browser.tabs.loadBookmarksInBackground", false);
 pref("browser.tabs.tabClipWidth", 140);
 pref("browser.tabs.animate", true);
-#ifdef UNIX_BUT_NOT_MAC
-pref("browser.tabs.drawInTitlebar", false);
-#else
 pref("browser.tabs.drawInTitlebar", true);
-#endif
 
 // When tabs opened by links in other tabs via a combination of
 // browser.link.open_newwindow being set to 3 and target="_blank" etc are
 // closed:
 // true   return to the tab that opened this tab (its owner)
 // false  return to the adjacent tab (old default)
 pref("browser.tabs.selectOwnerOnClose", true);
 

--- a/browser/base/moz.build
+++ b/browser/base/moz.build
@@ -32,15 +32,15 @@ DEFINES['MOZ_APP_VERSION'] = CONFIG['MOZ
 DEFINES['MOZ_APP_VERSION_DISPLAY'] = CONFIG['MOZ_APP_VERSION_DISPLAY']
 
 DEFINES['APP_LICENSE_BLOCK'] = '%s/content/overrides/app-license.html' % SRCDIR
 
 if CONFIG['MOZ_WIDGET_TOOLKIT'] in ('windows', 'gtk2', 'gtk3', 'cocoa'):
     DEFINES['HAVE_SHELL_SERVICE'] = 1
     DEFINES['CONTEXT_COPY_IMAGE_CONTENTS'] = 1
 
-if CONFIG['MOZ_WIDGET_TOOLKIT'] in ('windows', 'cocoa'):
+if CONFIG['MOZ_WIDGET_TOOLKIT'] in ('windows', 'cocoa', 'gtk3'):
     DEFINES['CAN_DRAW_IN_TITLEBAR'] = 1
 
 if CONFIG['MOZ_WIDGET_TOOLKIT'] in ('windows', 'gtk2', 'gtk3'):
     DEFINES['MENUBAR_CAN_AUTOHIDE'] = 1
 
 JAR_MANIFESTS += ['jar.mn']

--- a/toolkit/modules/moz.build
+++ b/toolkit/modules/moz.build
@@ -89,17 +89,17 @@ EXTRA_JS_MODULES += [
     'Troubleshoot.jsm',
     'UpdateUtils.jsm',
     'WebChannel.jsm',
     'WindowDraggingUtils.jsm',
     'ZipUtils.jsm',
 ]
 EXTRA_JS_MODULES.third_party.jsesc += ['third_party/jsesc/jsesc.js']
 
-if CONFIG['MOZ_WIDGET_TOOLKIT'] in ('windows', 'cocoa'):
+if CONFIG['MOZ_WIDGET_TOOLKIT'] in ('windows', 'cocoa', 'gtk3'):
     DEFINES['CAN_DRAW_IN_TITLEBAR'] = 1
 
 if CONFIG['MOZ_WIDGET_TOOLKIT'] in ('windows', 'gtk2', 'gtk3'):
     DEFINES['MENUBAR_CAN_AUTOHIDE'] = 1
 
 EXTRA_PP_JS_MODULES += [
     'AppConstants.jsm',
 ]