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diff --git a/widget/LookAndFeel.h b/widget/LookAndFeel.h
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+#ifndef __LookAndFeel
+#define __LookAndFeel
+
+#ifndef MOZILLA_INTERNAL_API
+#  error "This header is only usable from within libxul (MOZILLA_INTERNAL_API)."
+#endif
+
+#include "nsDebug.h"
+#include "nsColor.h"
+#include "nsString.h"
+#include "nsTArray.h"
+#include "mozilla/Maybe.h"
+#include "mozilla/widget/ThemeChangeKind.h"
+#include "mozilla/ColorScheme.h"
+
+struct gfxFontStyle;
+
+class nsIFrame;
+
+namespace mozilla {
+
+using Modifiers = uint16_t;
+struct StyleColorSchemeFlags;
+
+namespace dom {
+class Document;
+}
+
+namespace widget {
+class FullLookAndFeel;
+}  // namespace widget
+
+enum class StyleSystemColor : uint8_t;
+enum class StyleSystemColorScheme : uint8_t;
+enum class StyleSystemFont : uint8_t;
+
+class LookAndFeel {
+ public:
+  using ColorID = StyleSystemColor;
+  using ColorScheme = mozilla::ColorScheme;
+
+  // When modifying this list, also modify nsXPLookAndFeel::sIntPrefs
+  // in widget/xpwidgts/nsXPLookAndFeel.cpp.
+  enum class IntID {
+    // default, may be overriden by OS
+    CaretBlinkTime,
+    // Amount of blinks that happen before the caret stops blinking.
+    CaretBlinkCount,
+    // pixel width of caret
+    CaretWidth,
+    // show the caret when text is selected?
+    ShowCaretDuringSelection,
+    // select textfields when focused via tab/accesskey?
+    SelectTextfieldsOnKeyFocus,
+    // delay before submenus open
+    SubmenuDelay,
+    // can popups overlap menu/task bar?
+    MenusCanOverlapOSBar,
+    // should overlay scrollbars be used?
+    UseOverlayScrollbars,
+    // allow H and V overlay scrollbars to overlap?
+    AllowOverlayScrollbarsOverlap,
+    // skip navigating to disabled menu item?
+    SkipNavigatingDisabledMenuItem,
+    // begin a drag if the mouse is moved further than the threshold while the
+    // button is down
+    DragThresholdX,
+    DragThresholdY,
+    // Accessibility theme being used?
+    UseAccessibilityTheme,
+
+    // position of scroll arrows in a scrollbar
+    ScrollArrowStyle,
+
+    // each button can take one of four values:
+    ScrollButtonLeftMouseButtonAction,
+    // 0 - scrolls one  line, 1 - scrolls one page
+    ScrollButtonMiddleMouseButtonAction,
+    // 2 - scrolls to end, 3 - button ignored
+    ScrollButtonRightMouseButtonAction,
+
+    // delay for opening spring loaded folders
+    TreeOpenDelay,
+    // delay for closing spring loaded folders
+    TreeCloseDelay,
+    // delay for triggering the tree scrolling
+    TreeLazyScrollDelay,
+    // delay for scrolling the tree
+    TreeScrollDelay,
+    // the maximum number of lines to be scrolled at ones
+    TreeScrollLinesMax,
+    // What type of tab-order to use
+    TabFocusModel,
+    // Should menu items blink when they're chosen?
+    ChosenMenuItemsShouldBlink,
+
+    /*
+     * A Boolean value to determine whether the Windows accent color
+     * should be applied to the title bar.
+     *
+     * The value of this metric is not used on other platforms. These platforms
+     * should return NS_ERROR_NOT_IMPLEMENTED when queried for this metric.
+     */
+    WindowsAccentColorInTitlebar,
+
+    /*
+     * A Boolean value to determine whether the Windows default theme is
+     * being used.
+     *
+     * The value of this metric is not used on other platforms. These platforms
+     * should return NS_ERROR_NOT_IMPLEMENTED when queried for this metric.
+     */
+    WindowsDefaultTheme,
+
+    /*
+     * A Boolean value to determine whether the DWM compositor is being used
+     *
+     * This metric is not used on non-Windows platforms. These platforms
+     * should return NS_ERROR_NOT_IMPLEMENTED when queried for this metric.
+     */
+    DWMCompositor,
+
+    /*
+     * A Boolean value to determine whether Windows is themed (Classic vs.
+     * uxtheme)
+     *
+     * This is Windows-specific and is not implemented on other platforms
+     * (will return the default of NS_ERROR_FAILURE).
+     */
+    WindowsClassic,
+
+    /*
+     * A Boolean value to determine whether the current Windows desktop theme
+     * supports Aero Glass.
+     *
+     * This is Windows-specific and is not implemented on other platforms
+     * (will return the default of NS_ERROR_FAILURE).
+     */
+    WindowsGlass,
+
+    /*
+     * A Boolean value to determine whether the Mac graphite theme is
+     * being used.
+     */
+    MacGraphiteTheme,
+
+    /*
+     * A Boolean value to determine whether the macOS Big Sur-specific
+     * theming should be used.
+     */
+    MacBigSurTheme,
+
+    /*
+     * A Boolean value to determine whether macOS is in RTL mode or not.
+     */
+    MacRTL,
+
+    /*
+     * AlertNotificationOrigin indicates from which corner of the
+     * screen alerts slide in, and from which direction (horizontal/vertical).
+     * 0, the default, represents bottom right, sliding vertically.
+     * Use any bitwise combination of the following constants:
+     * NS_ALERT_HORIZONTAL (1), NS_ALERT_LEFT (2), NS_ALERT_TOP (4).
+     *
+     *       6       4
+     *     +-----------+
+     *    7|           |5
+     *     |           |
+     *    3|           |1
+     *     +-----------+
+     *       2       0
+     */
+    AlertNotificationOrigin,
+
+    /**
+     * If true, clicking on a scrollbar (not as in dragging the thumb) defaults
+     * to scrolling the view corresponding to the clicked point. Otherwise, we
+     * only do so if the scrollbar is clicked using the middle mouse button or
+     * if shift is pressed when the scrollbar is clicked.
+     */
+    ScrollToClick,
+
+    /**
+     * IME and spell checker underline styles, the values should be
+     * NS_DECORATION_LINE_STYLE_*.  They are defined below.
+     */
+    IMERawInputUnderlineStyle,
+    IMESelectedRawTextUnderlineStyle,
+    IMEConvertedTextUnderlineStyle,
+    IMESelectedConvertedTextUnderline,
+    SpellCheckerUnderlineStyle,
+
+    /**
+     * If this metric != 0, support window dragging on the menubar.
+     */
+    MenuBarDrag,
+    /**
+     * 0: scrollbar button repeats to scroll only when cursor is on the button.
+     * 1: scrollbar button repeats to scroll even if cursor is outside of it.
+     */
+    ScrollbarButtonAutoRepeatBehavior,
+    /**
+     * Delay before showing a tooltip.
+     */
+    TooltipDelay,
+    /*
+     * A Boolean value to determine whether swipe animations should be used.
+     */
+    SwipeAnimationEnabled,
+
+    /*
+     * Controls whether overlay scrollbars display when the user moves
+     * the mouse in a scrollable frame.
+     */
+    ScrollbarDisplayOnMouseMove,
+
+    /*
+     * Overlay scrollbar animation constants.
+     */
+    ScrollbarFadeBeginDelay,
+    ScrollbarFadeDuration,
+
+    /**
+     * Distance in pixels to offset the context menu from the cursor
+     * on open.
+     */
+    ContextMenuOffsetVertical,
+    ContextMenuOffsetHorizontal,
+
+    /*
+     * A boolean value indicating whether client-side decorations are
+     * supported by the user's GTK version.
+     */
+    GTKCSDAvailable,
+
+    /*
+     * A boolean value indicating whether client-side decorations should
+     * contain a minimize button.
+     */
+    GTKCSDMinimizeButton,
+
+    /*
+     * A boolean value indicating whether client-side decorations should
+     * contain a maximize button.
+     */
+    GTKCSDMaximizeButton,
+
+    /*
+     * A boolean value indicating whether client-side decorations should
+     * contain a close button.
+     */
+    GTKCSDCloseButton,
+
+    /**
+     * An Integer value that will represent the position of the Minimize button
+     * in GTK Client side decoration header.
+     */
+    GTKCSDMinimizeButtonPosition,
+
+    /**
+     * An Integer value that will represent the position of the Maximize button
+     * in GTK Client side decoration header.
+     */
+    GTKCSDMaximizeButtonPosition,
+
+    /**
+     * An Integer value that will represent the position of the Close button
+     * in GTK Client side decoration header.
+     */
+    GTKCSDCloseButtonPosition,
+
+    /*
+     * A boolean value indicating whether titlebar buttons are located
+     * in left titlebar corner.
+     */
+    GTKCSDReversedPlacement,
+
+    /*
+     * A boolean value indicating whether or not the OS is using a dark theme,
+     * which we may want to switch to as well if not overridden by the user.
+     */
+    SystemUsesDarkTheme,
+
+    /**
+     * Corresponding to prefers-reduced-motion.
+     * https://drafts.csswg.org/mediaqueries-5/#prefers-reduced-motion
+     * 0: no-preference
+     * 1: reduce
+     */
+    PrefersReducedMotion,
+
+    /**
+     * Corresponding to prefers-reduced-transparency.
+     * https://drafts.csswg.org/mediaqueries-5/#prefers-reduced-transparency
+     * 0: no-preference
+     * 1: reduce
+     */
+    PrefersReducedTransparency,
+
+    /**
+     * Corresponding to inverted-colors.
+     * https://drafts.csswg.org/mediaqueries-5/#inverted
+     * 0: none
+     * 1: inverted
+     */
+    InvertedColors,
+
+    /**
+     * Corresponding to PointerCapabilities in ServoTypes.h
+     * 0: None
+     * 1: Coarse
+     * 2: Fine
+     * 4: Hover
+     */
+    PrimaryPointerCapabilities,
+    /**
+     * Corresponding to union of PointerCapabilities values in ServoTypes.h
+     * E.g. if there is a mouse and a digitizer, the value will be
+     * 'Coarse | Fine | Hover'.
+     */
+    AllPointerCapabilities,
+
+    /** The scrollbar size, in CSS pixels. */
+    SystemScrollbarSize,
+
+    /** A boolean value to determine whether a touch device is present */
+    TouchDeviceSupportPresent,
+
+    /** GTK titlebar radius */
+    TitlebarRadius,
+
+    /**
+     * Corresponding to dynamic-range.
+     * https://drafts.csswg.org/mediaqueries-5/#dynamic-range
+     * 0: Standard
+     * 1: High
+     */
+    DynamicRange,
+    VideoDynamicRange,
+
+    /** Whether XUL panel animations are enabled. */
+    PanelAnimations,
+
+    /*
+     * Not an ID; used to define the range of valid IDs.  Must be last.
+     */
+    End,
+  };
+
+  // This is a common enough integer that seems worth the shortcut.
+  static bool UseOverlayScrollbars() {
+    return GetInt(IntID::UseOverlayScrollbars);
+  }
+
+  // Returns keyCode value of a modifier key which is used for accesskey.
+  // Returns 0 if the platform doesn't support access key.
+  static uint32_t GetMenuAccessKey();
+  // Modifier mask for the menu accesskey.
+  static Modifiers GetMenuAccessKeyModifiers();
+
+  enum {
+    eScrollArrow_None = 0,
+    eScrollArrow_StartBackward = 0x1000,
+    eScrollArrow_StartForward = 0x0100,
+    eScrollArrow_EndBackward = 0x0010,
+    eScrollArrow_EndForward = 0x0001
+  };
+
+  enum {
+    // single arrow at each end
+    eScrollArrowStyle_Single =
+        eScrollArrow_StartBackward | eScrollArrow_EndForward,
+    // both arrows at bottom/right, none at top/left
+    eScrollArrowStyle_BothAtBottom =
+        eScrollArrow_EndBackward | eScrollArrow_EndForward,
+    // both arrows at both ends
+    eScrollArrowStyle_BothAtEachEnd =
+        eScrollArrow_EndBackward | eScrollArrow_EndForward |
+        eScrollArrow_StartBackward | eScrollArrow_StartForward,
+    // both arrows at top/left, none at bottom/right
+    eScrollArrowStyle_BothAtTop =
+        eScrollArrow_StartBackward | eScrollArrow_StartForward
+  };
+
+  // When modifying this list, also modify nsXPLookAndFeel::sFloatPrefs
+  // in widget/nsXPLookAndFeel.cpp.
+  enum class FloatID {
+    IMEUnderlineRelativeSize,
+    SpellCheckerUnderlineRelativeSize,
+
+    // The width/height ratio of the cursor. If used, the CaretWidth int metric
+    // should be added to the calculated caret width.
+    CaretAspectRatio,
+
+    // GTK text scale factor.
+    TextScaleFactor,
+
+    // Mouse pointer scaling factor.
+    CursorScale,
+
+    // Not an ID; used to define the range of valid IDs.  Must be last.
+    End,
+  };
+
+  using FontID = mozilla::StyleSystemFont;
+
+  static bool WindowsNonNativeMenusEnabled();
+
+  static ColorScheme SystemColorScheme() {
+    return GetInt(IntID::SystemUsesDarkTheme) ? ColorScheme::Dark
+                                              : ColorScheme::Light;
+  }
+
+  static bool IsDarkColor(nscolor);
+
+  enum class ChromeColorSchemeSetting { Light, Dark, System };
+  static ChromeColorSchemeSetting ColorSchemeSettingForChrome();
+  static ColorScheme ThemeDerivedColorSchemeForContent();
+
+  static ColorScheme ColorSchemeForChrome() {
+    MOZ_ASSERT(sColorSchemeInitialized);
+    return sChromeColorScheme;
+  }
+  static ColorScheme PreferredColorSchemeForContent() {
+    MOZ_ASSERT(sColorSchemeInitialized);
+    return sContentColorScheme;
+  }
+
+  static ColorScheme ColorSchemeForStyle(
+      const dom::Document&, const StyleColorSchemeFlags&,
+      ColorSchemeMode = ColorSchemeMode::Used);
+  static ColorScheme ColorSchemeForFrame(
+      const nsIFrame*, ColorSchemeMode = ColorSchemeMode::Used);
+
+  // Whether standins for native colors should be used (that is, colors faked,
+  // taken from win7, mostly). This forces light appearance, effectively.
+  enum class UseStandins : bool { No, Yes };
+  static UseStandins ShouldUseStandins(const dom::Document&, ColorID);
+
+  // Returns a native color value (might be overwritten by prefs) for a given
+  // color id.
+  //
+  // NOTE:
+  //   ColorID::TextSelectForeground might return NS_SAME_AS_FOREGROUND_COLOR.
+  //   ColorID::IME* might return NS_TRANSPARENT, NS_SAME_AS_FOREGROUND_COLOR or
+  //   NS_40PERCENT_FOREGROUND_COLOR.
+  //   These values have particular meaning.  Then, they are not an actual
+  //   color value.
+  static Maybe<nscolor> GetColor(ColorID, ColorScheme, UseStandins);
+
+  // Gets the color with appropriate defaults for UseStandins, ColorScheme etc
+  // for a given frame.
+  static Maybe<nscolor> GetColor(ColorID, const nsIFrame*);
+
+  // Versions of the above which returns the color if found, or a default (which
+  // defaults to opaque black) otherwise.
+  static nscolor Color(ColorID aId, ColorScheme aScheme,
+                       UseStandins aUseStandins,
+                       nscolor aDefault = NS_RGB(0, 0, 0)) {
+    return GetColor(aId, aScheme, aUseStandins).valueOr(aDefault);
+  }
+
+  static nscolor Color(ColorID aId, nsIFrame* aFrame,
+                       nscolor aDefault = NS_RGB(0, 0, 0)) {
+    return GetColor(aId, aFrame).valueOr(aDefault);
+  }
+
+  static float GetTextScaleFactor() {
+    float f = GetFloat(FloatID::TextScaleFactor, 1.0f);
+    if (MOZ_UNLIKELY(f <= 0.0f)) {
+      return 1.0f;
+    }
+    return f;
+  }
+
+  struct ZoomSettings {
+    float mFullZoom = 1.0f;
+    float mTextZoom = 1.0f;
+  };
+
+  static ZoomSettings SystemZoomSettings();
+
+  /**
+   * GetInt() and GetFloat() return a int or float value for aID.  The result
+   * might be distance, time, some flags or a int value which has particular
+   * meaning.  See each document at definition of each ID for the detail.
+   * The result is always 0 when they return error.  Therefore, if you want to
+   * use a value for the default value, you should use the other method which
+   * returns int or float directly.
+   */
+  static nsresult GetInt(IntID, int32_t* aResult);
+  static nsresult GetFloat(FloatID aID, float* aResult);
+
+  static int32_t GetInt(IntID aID, int32_t aDefault = 0) {
+    int32_t result;
+    if (NS_FAILED(GetInt(aID, &result))) {
+      return aDefault;
+    }
+    return result;
+  }
+
+  static float GetFloat(FloatID aID, float aDefault = 0.0f) {
+    float result;
+    if (NS_FAILED(GetFloat(aID, &result))) {
+      return aDefault;
+    }
+    return result;
+  }
+
+  /**
+   * Retrieve the name and style of a system-theme font.  Returns true
+   * if the system theme specifies this font, false if a default should
+   * be used.  In the latter case neither aName nor aStyle is modified.
+   *
+   * Size of the font should be in CSS pixels, not device pixels.
+   *
+   * @param aID    Which system-theme font is wanted.
+   * @param aName  The name of the font to use.
+   * @param aStyle Styling to apply to the font.
+   */
+  static bool GetFont(FontID aID, nsString& aName, gfxFontStyle& aStyle);
+
+  /**
+   * GetPasswordCharacter() returns a unicode character which should be used
+   * for a masked character in password editor.  E.g., '*'.
+   */
+  static char16_t GetPasswordCharacter();
+
+  /**
+   * If the latest character in password field shouldn't be hidden by the
+   * result of GetPasswordCharacter(), GetEchoPassword() returns TRUE.
+   * Otherwise, FALSE.
+   */
+  static bool GetEchoPassword();
+
+  /**
+   * Whether we should be drawing in the titlebar by default.
+   */
+  static bool DrawInTitlebar();
+
+  /**
+   * The millisecond to mask password value.
+   * This value is only valid when GetEchoPassword() returns true.
+   */
+  static uint32_t GetPasswordMaskDelay();
+
+  /** Gets theme information for about:support */
+  static void GetThemeInfo(nsACString&);
+
+  /**
+   * When system look and feel is changed, Refresh() must be called.  Then,
+   * cached data would be released.
+   */
+  static void Refresh();
+
+  /**
+   * GTK's initialization code can't be run off main thread, call this
+   * if you plan on using LookAndFeel off main thread later.
+   *
+   * This initialized state may get reset due to theme changes, so it
+   * must be called prior to each potential off-main-thread LookAndFeel
+   * call, not just once.
+   */
+  static void NativeInit();
+
+  static void SetData(widget::FullLookAndFeel&& aTables);
+  static void NotifyChangedAllWindows(widget::ThemeChangeKind);
+  static bool HasPendingGlobalThemeChange() { return sGlobalThemeChanged; }
+  static void HandleGlobalThemeChange() {
+    if (MOZ_UNLIKELY(HasPendingGlobalThemeChange())) {
+      DoHandleGlobalThemeChange();
+    }
+  }
+  static void EnsureColorSchemesInitialized() {
+    if (!sColorSchemeInitialized) {
+      RecomputeColorSchemes();
+    }
+    MOZ_ASSERT(sColorSchemeInitialized);
+  }
+
+  static ColorScheme sChromeColorScheme;
+  static ColorScheme sContentColorScheme;
+
+ protected:
+  static void RecomputeColorSchemes();
+  static bool sColorSchemeInitialized;
+
+  static void DoHandleGlobalThemeChange();
+  // Set to true when ThemeChanged needs to be called on mTheme (and other
+  // global LookAndFeel.  This is used because mTheme is a service, so there's
+  // no need to notify it from more than one prescontext.
+  static bool sGlobalThemeChanged;
+};
+
+}  // namespace mozilla
+
+// ---------------------------------------------------------------------
+//  Special colors for ColorID::IME* and ColorID::SpellCheckerUnderline
+// ---------------------------------------------------------------------
+
+// For background color only.
+constexpr nscolor NS_TRANSPARENT = NS_RGBA(0x01, 0x00, 0x00, 0x00);
+// For foreground color only.
+constexpr nscolor NS_SAME_AS_FOREGROUND_COLOR = NS_RGBA(0x02, 0x00, 0x00, 0x00);
+constexpr nscolor NS_40PERCENT_FOREGROUND_COLOR =
+    NS_RGBA(0x03, 0x00, 0x00, 0x00);
+
+#define NS_IS_SELECTION_SPECIAL_COLOR(c)                          \
+  ((c) == NS_TRANSPARENT || (c) == NS_SAME_AS_FOREGROUND_COLOR || \
+   (c) == NS_40PERCENT_FOREGROUND_COLOR)
+
+// ------------------------------------------
+//  Bits for IntID::AlertNotificationOrigin
+// ------------------------------------------
+
+#define NS_ALERT_HORIZONTAL 1
+#define NS_ALERT_LEFT 2
+#define NS_ALERT_TOP 4
+
+#endif /* __LookAndFeel */