--- a/widget/uikit/nsLookAndFeel.h
+++ b/widget/uikit/nsLookAndFeel.h
@@ -9,28 +9,37 @@
 #include "nsXPLookAndFeel.h"
 
 class nsLookAndFeel final : public nsXPLookAndFeel
 {
 public:
     nsLookAndFeel();
     virtual ~nsLookAndFeel();
 
+    virtual void NativeInit() final;
+    virtual void RefreshImpl();
     virtual nsresult NativeGetColor(const ColorID aID, nscolor &aResult);
-    virtual void NativeInit() final {};
     virtual nsresult GetIntImpl(IntID aID, int32_t &aResult);
     virtual nsresult GetFloatImpl(FloatID aID, float &aResult);
     virtual bool GetFontImpl(FontID aID, nsString& aFontName,
                              gfxFontStyle& aFontStyle,
                              float aDevPixPerCSSPixel);
     virtual char16_t GetPasswordCharacterImpl()
     {
         // unicode value for the bullet character, used for password textfields.
         return 0x2022;
     }
 
     static bool UseOverlayScrollbars()
     {
         return true;
     }
+
+private:
+    nscolor mColorTextSelectForeground;
+    nscolor mColorDarkText;
+
+    bool mInitialized;
+
+    void EnsureInit();
 };
 
 #endif

--- a/widget/uikit/nsLookAndFeel.mm
+++ b/widget/uikit/nsLookAndFeel.mm
@@ -8,16 +8,17 @@
 
 #include "nsLookAndFeel.h"
 #include "nsStyleConsts.h"
 #include "gfxFont.h"
 #include "gfxFontConstants.h"
 
 nsLookAndFeel::nsLookAndFeel()
     : nsXPLookAndFeel()
+    , mInitialized(false)
 {
 }
 
 nsLookAndFeel::~nsLookAndFeel()
 {
 }
 
 static nscolor GetColorFromUIColor(UIColor* aColor)
@@ -34,19 +35,35 @@ static nscolor GetColorFromUIColor(UICol
         unsigned int val = (unsigned int)(components[0] * 255.0);
         return NS_RGBA(val, val, val,
                        (unsigned int)(components[1] * 255.0));
     }
     NS_NOTREACHED("Unhandled color space!");
     return 0;
 }
 
+void
+nsLookAndFeel::NativeInit()
+{
+  EnsureInit();
+}
+
+void
+nsLookAndFeel::RefreshImpl()
+{
+  nsXPLookAndFeel::RefreshImpl();
+
+  mInitialized = false;
+}
+
 nsresult
 nsLookAndFeel::NativeGetColor(const ColorID aID, nscolor &aResult)
 {
+  EnsureInit();
+
   nsresult res = NS_OK;
 
   switch (aID) {
     case eColorID_WindowBackground:
       aResult = NS_RGB(0xff,0xff,0xff);
       break;
     case eColorID_WindowForeground:
       aResult = NS_RGB(0x00,0x00,0x00);
@@ -80,21 +97,17 @@ nsLookAndFeel::NativeGetColor(const Colo
       aResult = NS_RGB(0xaa,0xaa,0xaa);
       break;
     case eColorID__moz_menuhover:
       aResult = NS_RGB(0xee,0xee,0xee);
       break;
     case eColorID_TextSelectForeground:
     case eColorID_highlighttext:  // CSS2 color
     case eColorID__moz_menuhovertext:
-      GetColor(eColorID_TextSelectBackground, aResult);
-      if (aResult == 0x000000)
-        aResult = NS_RGB(0xff,0xff,0xff);
-      else
-        aResult = NS_DONT_CHANGE_COLOR;
+      aResult = mColorTextSelectForeground;
       break;
     case eColorID_IMESelectedRawTextBackground:
     case eColorID_IMESelectedConvertedTextBackground:
     case eColorID_IMERawInputBackground:
     case eColorID_IMEConvertedTextBackground:
       aResult = NS_TRANSPARENT;
       break;
     case eColorID_IMESelectedRawTextForeground:
@@ -120,17 +133,17 @@ nsLookAndFeel::NativeGetColor(const Colo
     //
     case eColorID_buttontext:
     case eColorID__moz_buttonhovertext:
     case eColorID_captiontext:
     case eColorID_menutext:
     case eColorID_infotext:
     case eColorID__moz_menubartext:
     case eColorID_windowtext:
-      aResult = GetColorFromUIColor([UIColor darkTextColor]);
+      aResult = mColorDarkText;
       break;
     case eColorID_activecaption:
       aResult = NS_RGB(0xff,0xff,0xff);
       break;
     case eColorID_activeborder:
       aResult = NS_RGB(0x00,0x00,0x00);
       break;
      case eColorID_appworkspace:
@@ -190,25 +203,25 @@ nsLookAndFeel::NativeGetColor(const Colo
       break;
     case eColorID_window:
     case eColorID__moz_field:
     case eColorID__moz_combobox:
       aResult = NS_RGB(0xff,0xff,0xff);
       break;
     case eColorID__moz_fieldtext:
     case eColorID__moz_comboboxtext:
-      aResult = GetColorFromUIColor([UIColor darkTextColor]);
+      aResult = mColorDarkText;
       break;
     case eColorID__moz_dialog:
       aResult = NS_RGB(0xaa,0xaa,0xaa);
       break;
     case eColorID__moz_dialogtext:
     case eColorID__moz_cellhighlighttext:
     case eColorID__moz_html_cellhighlighttext:
-      aResult = GetColorFromUIColor([UIColor darkTextColor]);
+      aResult = mColorDarkText;
       break;
     case eColorID__moz_dragtargetzone:
     case eColorID__moz_mac_chrome_active:
     case eColorID__moz_mac_chrome_inactive:
       aResult = NS_RGB(0xaa,0xaa,0xaa);
       break;
     case eColorID__moz_mac_focusring:
       aResult = NS_RGB(0x3F,0x98,0xDD);
@@ -394,8 +407,27 @@ nsLookAndFeel::GetFontImpl(FontID aID, n
 
         aFontName.AssignLiteral("sans-serif");
         return true;
     }
 
     //TODO: implement more here?
     return false;
 }
+
+void
+nsLookAndFeel::EnsureInit()
+{
+  if (mInitialized) {
+    return;
+  }
+  mInitialized = true;
+
+  nscolor color;
+  GetColor(eColorID_TextSelectBackground, color);
+  if (color == 0x000000) {
+    mColorTextSelectForeground = NS_RGB(0xff,0xff,0xff);
+  } else {
+    mColorTextSelectForeground = NS_DONT_CHANGE_COLOR;
+  }
+
+  mColorDarkText = GetColorFromUIColor([UIColor darkTextColor]);
+}