--- a/widget/gtk/nsLookAndFeel.cpp
+++ b/widget/gtk/nsLookAndFeel.cpp
@@ -634,16 +634,32 @@ nsLookAndFeel::GetIntImpl(IntID aID, int
         break;
     case eIntID_SwipeAnimationEnabled:
         aResult = 0;
         break;
     case eIntID_ContextMenuOffsetVertical:
     case eIntID_ContextMenuOffsetHorizontal:
         aResult = 2;
         break;
+    case eIntID_GTKCSDAvailable:
+        EnsureInit();
+        aResult = sCSDAvailable;
+        break;
+    case eIntID_GTKCSDMaximizeButton:
+        EnsureInit();
+        aResult = sCSDMaximizeButton;
+        break;
+    case eIntID_GTKCSDMinimizeButton:
+        EnsureInit();
+        aResult = sCSDMinimizeButton;
+        break;
+    case eIntID_GTKCSDCloseButton:
+        EnsureInit();
+        aResult = sCSDCloseButton;
+        break;
     default:
         aResult = 0;
         res     = NS_ERROR_FAILURE;
     }
 
     return res;
 }
 

--- a/widget/gtk/nsLookAndFeel.h
+++ b/widget/gtk/nsLookAndFeel.h
@@ -77,14 +77,18 @@ protected:
     nscolor sMozWindowInactiveCaption;
     nscolor sTextSelectedText;
     nscolor sTextSelectedBackground;
     nscolor sMozScrollbar;
     nscolor sInfoBarText;
     char16_t sInvisibleCharacter;
     float   sCaretRatio;
     bool    sMenuSupportsDrag;
+    bool    sCSDAvailable;
+    bool    sCSDMaximizeButton;
+    bool    sCSDMinimizeButton;
+    bool    sCSDCloseButton;
     bool    mInitialized;
 
     void EnsureInit();
 };
 
 #endif