--- a/layout/style/nsCSSKeywordList.h
+++ b/layout/style/nsCSSKeywordList.h
@@ -243,28 +243,26 @@ CSS_KEY(double-circle, double_circle)
 CSS_KEY(double-struck, double_struck)
 CSS_KEY(drag, drag)
 CSS_KEY(drop-shadow, drop_shadow)
 CSS_KEY(e-resize, e_resize)
 CSS_KEY(ease, ease)
 CSS_KEY(ease-in, ease_in)
 CSS_KEY(ease-in-out, ease_in_out)
 CSS_KEY(ease-out, ease_out)
-CSS_KEY(economy, economy)
 CSS_KEY(element, element)
 CSS_KEY(elements, elements)
 CSS_KEY(ellipse, ellipse)
 CSS_KEY(ellipsis, ellipsis)
 CSS_KEY(em, em)
 CSS_KEY(embed, embed)
 CSS_KEY(enabled, enabled)
 CSS_KEY(end, end)
 CSS_KEY(ethiopic-numeric, ethiopic_numeric)
 CSS_KEY(ex, ex)
-CSS_KEY(exact, exact)
 CSS_KEY(exclude, exclude)
 CSS_KEY(exclusion, exclusion)
 CSS_KEY(expanded, expanded)
 CSS_KEY(extends, extends)
 CSS_KEY(extra-condensed, extra_condensed)
 CSS_KEY(extra-expanded, extra_expanded)
 CSS_KEY(ew-resize, ew_resize)
 CSS_KEY(fallback, fallback)

--- a/layout/style/nsCSSPropList.h
+++ b/layout/style/nsCSSPropList.h
@@ -1383,26 +1383,16 @@ CSS_PROP_COLOR(
         CSS_PROPERTY_APPLIES_TO_PLACEHOLDER |
         CSS_PROPERTY_IGNORED_WHEN_COLORS_DISABLED |
         CSS_PROPERTY_HASHLESS_COLOR_QUIRK,
     "",
     VARIANT_HC,
     nullptr,
     offsetof(nsStyleColor, mColor),
     eStyleAnimType_Color)
-CSS_PROP_VISIBILITY(
-    color-adjust,
-    color_adjust,
-    ColorAdjust,
-    CSS_PROPERTY_PARSE_VALUE,
-    "layout.css.color-adjust.enabled",
-    VARIANT_HK,
-    kColorAdjustKTable,
-    CSS_PROP_NO_OFFSET,
-    eStyleAnimType_None)
 CSS_PROP_SHORTHAND(
     -moz-columns,
     _moz_columns,
     CSS_PROP_DOMPROP_PREFIXED(Columns),
     CSS_PROPERTY_PARSE_FUNCTION,
     "")
 CSS_PROP_COLUMN(
     -moz-column-count,

--- a/layout/style/nsCSSProps.cpp
+++ b/layout/style/nsCSSProps.cpp
@@ -2361,22 +2361,16 @@ const KTableEntry nsCSSProps::kTextRende
 };
 
 const KTableEntry nsCSSProps::kVectorEffectKTable[] = {
   { eCSSKeyword_none, NS_STYLE_VECTOR_EFFECT_NONE },
   { eCSSKeyword_non_scaling_stroke, NS_STYLE_VECTOR_EFFECT_NON_SCALING_STROKE },
   { eCSSKeyword_UNKNOWN, -1 }
 };
 
-const KTableEntry nsCSSProps::kColorAdjustKTable[] = {
-  { eCSSKeyword_economy, NS_STYLE_COLOR_ADJUST_ECONOMY },
-  { eCSSKeyword_exact, NS_STYLE_COLOR_ADJUST_EXACT },
-  { eCSSKeyword_UNKNOWN, -1 }
-};
-
 const KTableEntry nsCSSProps::kColorInterpolationKTable[] = {
   { eCSSKeyword_auto, NS_STYLE_COLOR_INTERPOLATION_AUTO },
   { eCSSKeyword_srgb, NS_STYLE_COLOR_INTERPOLATION_SRGB },
   { eCSSKeyword_linearrgb, NS_STYLE_COLOR_INTERPOLATION_LINEARRGB },
   { eCSSKeyword_UNKNOWN, -1 }
 };
 
 const KTableEntry nsCSSProps::kColumnFillKTable[] = {

--- a/layout/style/nsCSSProps.h
+++ b/layout/style/nsCSSProps.h
@@ -702,17 +702,16 @@ public:
   static const KTableEntry kImageRenderingKTable[];
   static const KTableEntry kShapeRenderingKTable[];
   static const KTableEntry kStrokeLinecapKTable[];
   static const KTableEntry kStrokeLinejoinKTable[];
   static const KTableEntry kStrokeContextValueKTable[];
   static const KTableEntry kVectorEffectKTable[];
   static const KTableEntry kTextAnchorKTable[];
   static const KTableEntry kTextRenderingKTable[];
-  static const KTableEntry kColorAdjustKTable[];
   static const KTableEntry kColorInterpolationKTable[];
   static const KTableEntry kColumnFillKTable[];
   static const KTableEntry kBoxPropSourceKTable[];
   static const KTableEntry kBoxShadowTypeKTable[];
   static const KTableEntry kBoxSizingKTable[];
   static const KTableEntry kCaptionSideKTable[];
   // Not const because we modify its entries when the pref
   // "layout.css.float-logical-values.enabled" changes:

--- a/layout/style/nsComputedDOMStyle.cpp
+++ b/layout/style/nsComputedDOMStyle.cpp
@@ -975,26 +975,16 @@ already_AddRefed<CSSValue>
 nsComputedDOMStyle::DoGetColor()
 {
   RefPtr<nsROCSSPrimitiveValue> val = new nsROCSSPrimitiveValue;
   SetToRGBAColor(val, StyleColor()->mColor);
   return val.forget();
 }
 
 already_AddRefed<CSSValue>
-nsComputedDOMStyle::DoGetColorAdjust()
-{
-  RefPtr<nsROCSSPrimitiveValue> val = new nsROCSSPrimitiveValue;
-  val->SetIdent(
-    nsCSSProps::ValueToKeywordEnum(StyleVisibility()->mColorAdjust,
-                                   nsCSSProps::kColorAdjustKTable));
-  return val.forget();
-}
-
-already_AddRefed<CSSValue>
 nsComputedDOMStyle::DoGetOpacity()
 {
   RefPtr<nsROCSSPrimitiveValue> val = new nsROCSSPrimitiveValue;
   val->SetNumber(StyleDisplay()->mOpacity);
   return val.forget();
 }
 
 already_AddRefed<CSSValue>

--- a/layout/style/nsComputedDOMStyle.h
+++ b/layout/style/nsComputedDOMStyle.h
@@ -423,17 +423,16 @@ private:
   already_AddRefed<CSSValue> DoGetWordBreak();
   already_AddRefed<CSSValue> DoGetWordWrap();
   already_AddRefed<CSSValue> DoGetHyphens();
   already_AddRefed<CSSValue> DoGetTabSize();
   already_AddRefed<CSSValue> DoGetTextSizeAdjust();
   already_AddRefed<CSSValue> DoGetWebkitTextFillColor();
 
   /* Visibility properties */
-  already_AddRefed<CSSValue> DoGetColorAdjust();
   already_AddRefed<CSSValue> DoGetOpacity();
   already_AddRefed<CSSValue> DoGetPointerEvents();
   already_AddRefed<CSSValue> DoGetVisibility();
   already_AddRefed<CSSValue> DoGetWritingMode();
 
   /* Direction properties */
   already_AddRefed<CSSValue> DoGetDirection();
   already_AddRefed<CSSValue> DoGetUnicodeBidi();

--- a/layout/style/nsComputedDOMStylePropertyList.h
+++ b/layout/style/nsComputedDOMStylePropertyList.h
@@ -97,17 +97,16 @@ COMPUTED_STYLE_PROP(border_top_width,   
 COMPUTED_STYLE_PROP(bottom,                        Bottom)
 COMPUTED_STYLE_PROP(box_decoration_break,          BoxDecorationBreak)
 COMPUTED_STYLE_PROP(box_shadow,                    BoxShadow)
 COMPUTED_STYLE_PROP(box_sizing,                    BoxSizing)
 COMPUTED_STYLE_PROP(caption_side,                  CaptionSide)
 COMPUTED_STYLE_PROP(clear,                         Clear)
 COMPUTED_STYLE_PROP(clip,                          Clip)
 COMPUTED_STYLE_PROP(color,                         Color)
-COMPUTED_STYLE_PROP(color_adjust,                  ColorAdjust)
 COMPUTED_STYLE_PROP(contain,                       Contain)
 COMPUTED_STYLE_PROP(content,                       Content)
 COMPUTED_STYLE_PROP(counter_increment,             CounterIncrement)
 COMPUTED_STYLE_PROP(counter_reset,                 CounterReset)
 COMPUTED_STYLE_PROP(cursor,                        Cursor)
 COMPUTED_STYLE_PROP(direction,                     Direction)
 COMPUTED_STYLE_PROP(display,                       Display)
 COMPUTED_STYLE_PROP(empty_cells,                   EmptyCells)

--- a/layout/style/nsRuleNode.cpp
+++ b/layout/style/nsRuleNode.cpp
@@ -6456,22 +6456,16 @@ nsRuleNode::ComputeVisibilityData(void* 
         break;
       default:
         NS_NOTREACHED("Invalid image-orientation enumerated value");
     }
   } else {
     MOZ_ASSERT(orientation->GetUnit() == eCSSUnit_Null, "Should be null unit");
   }
 
-  SetDiscrete(*aRuleData->ValueForColorAdjust(), visibility->mColorAdjust,
-              conditions,
-              SETDSC_ENUMERATED | SETDSC_UNSET_INHERIT,
-              parentVisibility->mColorAdjust,
-              NS_STYLE_COLOR_ADJUST_ECONOMY, 0, 0, 0, 0);
-
   COMPUTE_END_INHERITED(Visibility, visibility)
 }
 
 const void*
 nsRuleNode::ComputeColorData(void* aStartStruct,
                              const nsRuleData* aRuleData,
                              nsStyleContext* aContext,
                              nsRuleNode* aHighestNode,

--- a/layout/style/nsStyleConsts.h
+++ b/layout/style/nsStyleConsts.h
@@ -1116,20 +1116,16 @@ enum class FillMode : uint32_t;
 #define NS_STYLE_TEXT_EMPHASIS_STYLE_STRING         255
 
 // text-rendering
 #define NS_STYLE_TEXT_RENDERING_AUTO               0
 #define NS_STYLE_TEXT_RENDERING_OPTIMIZESPEED      1
 #define NS_STYLE_TEXT_RENDERING_OPTIMIZELEGIBILITY 2
 #define NS_STYLE_TEXT_RENDERING_GEOMETRICPRECISION 3
 
-// adjust-color
-#define NS_STYLE_COLOR_ADJUST_ECONOMY               0
-#define NS_STYLE_COLOR_ADJUST_EXACT                 1
-
 // color-interpolation and color-interpolation-filters
 #define NS_STYLE_COLOR_INTERPOLATION_AUTO           0
 #define NS_STYLE_COLOR_INTERPOLATION_SRGB           1
 #define NS_STYLE_COLOR_INTERPOLATION_LINEARRGB      2
 
 // vector-effect
 #define NS_STYLE_VECTOR_EFFECT_NONE                 0
 #define NS_STYLE_VECTOR_EFFECT_NON_SCALING_STROKE   1

--- a/layout/style/nsStyleStruct.cpp
+++ b/layout/style/nsStyleStruct.cpp
@@ -3167,29 +3167,27 @@ nsStyleVisibility::nsStyleVisibility(nsP
     mDirection = NS_STYLE_DIRECTION_RTL;
   else
     mDirection = NS_STYLE_DIRECTION_LTR;
 
   mVisible = NS_STYLE_VISIBILITY_VISIBLE;
   mPointerEvents = NS_STYLE_POINTER_EVENTS_AUTO;
   mWritingMode = NS_STYLE_WRITING_MODE_HORIZONTAL_TB;
   mTextOrientation = NS_STYLE_TEXT_ORIENTATION_MIXED;
-  mColorAdjust = NS_STYLE_COLOR_ADJUST_ECONOMY;
 }
 
 nsStyleVisibility::nsStyleVisibility(const nsStyleVisibility& aSource)
 {
   MOZ_COUNT_CTOR(nsStyleVisibility);
   mImageOrientation = aSource.mImageOrientation;
   mDirection = aSource.mDirection;
   mVisible = aSource.mVisible;
   mPointerEvents = aSource.mPointerEvents;
   mWritingMode = aSource.mWritingMode;
   mTextOrientation = aSource.mTextOrientation;
-  mColorAdjust = aSource.mColorAdjust;
 } 
 
 nsChangeHint nsStyleVisibility::CalcDifference(const nsStyleVisibility& aOther) const
 {
   nsChangeHint hint = nsChangeHint(0);
 
   if (mDirection != aOther.mDirection || mWritingMode != aOther.mWritingMode) {
     // It's important that a change in mWritingMode results in frame
@@ -3214,20 +3212,16 @@ nsChangeHint nsStyleVisibility::CalcDiff
     }
     if (mPointerEvents != aOther.mPointerEvents) {
       // nsSVGPathGeometryFrame's mRect depends on stroke _and_ on the value
       // of pointer-events. See nsSVGPathGeometryFrame::ReflowSVG's use of
       // GetHitTestFlags. (Only a reflow, no visual change.)
       NS_UpdateHint(hint, nsChangeHint_NeedReflow);
       NS_UpdateHint(hint, nsChangeHint_NeedDirtyReflow); // XXX remove me: bug 876085
     }
-    if (mColorAdjust != aOther.mColorAdjust) {
-      // color-adjust only affects media where dynamic changes can't happen.
-      NS_UpdateHint(hint, nsChangeHint_NeutralChange);
-    }
   }
   return hint;
 }
 
 nsStyleContentData::~nsStyleContentData()
 {
   MOZ_ASSERT(!mImageTracked,
              "nsStyleContentData being destroyed while still tracking image!");

--- a/layout/style/nsStyleStruct.h
+++ b/layout/style/nsStyleStruct.h
@@ -2104,34 +2104,32 @@ struct nsStyleVisibility
   void Destroy(nsPresContext* aContext) {
     this->~nsStyleVisibility();
     aContext->PresShell()->
       FreeByObjectID(mozilla::eArenaObjectID_nsStyleVisibility, this);
   }
 
   nsChangeHint CalcDifference(const nsStyleVisibility& aOther) const;
   static nsChangeHint MaxDifference() {
-    return NS_STYLE_HINT_FRAMECHANGE |
-           nsChangeHint_NeutralChange;
+    return NS_STYLE_HINT_FRAMECHANGE;
   }
   static nsChangeHint DifferenceAlwaysHandledForDescendants() {
     // CalcDifference never returns the reflow hints that are sometimes
     // handled for descendants as hints not handled for descendants.
     return nsChangeHint_NeedReflow |
            nsChangeHint_ReflowChangesSizeOrPosition |
            nsChangeHint_ClearAncestorIntrinsics;
   }
 
   nsStyleImageOrientation mImageOrientation;  // [inherited]
   uint8_t mDirection;                  // [inherited] see nsStyleConsts.h NS_STYLE_DIRECTION_*
   uint8_t mVisible;                    // [inherited]
   uint8_t mPointerEvents;              // [inherited] see nsStyleConsts.h
   uint8_t mWritingMode;                // [inherited] see nsStyleConsts.h
   uint8_t mTextOrientation;            // [inherited] see nsStyleConsts.h
-  uint8_t mColorAdjust;                // [inherited] see nsStyleConsts.h
 
   bool IsVisible() const {
     return (mVisible == NS_STYLE_VISIBILITY_VISIBLE);
   }
 
   bool IsVisibleOrCollapsed() const {
     return ((mVisible == NS_STYLE_VISIBILITY_VISIBLE) ||
             (mVisible == NS_STYLE_VISIBILITY_COLLAPSE));

--- a/layout/style/test/property_database.js
+++ b/layout/style/test/property_database.js
@@ -1363,24 +1363,16 @@ var gCSSProperties = {
   },
   "-moz-box-sizing": {
     domProp: "MozBoxSizing",
     inherited: false,
     type: CSS_TYPE_SHORTHAND_AND_LONGHAND,
     alias_for: "box-sizing",
     subproperties: [ "box-sizing" ],
   },
-  "color-adjust": {
-    domProp: "colorAdjust",
-    inherited: true,
-    type: CSS_TYPE_LONGHAND,
-    initial_values: [ "economy" ],
-    other_values: [ "exact" ],
-    invalid_values: []
-  },
   "-moz-columns": {
     domProp: "MozColumns",
     inherited: false,
     type: CSS_TYPE_TRUE_SHORTHAND,
     subproperties: [ "-moz-column-count", "-moz-column-width" ],
     initial_values: [ "auto", "auto auto" ],
     other_values: [ "3", "20px", "2 10px", "10px 2", "2 auto", "auto 2", "auto 50px", "50px auto" ],
     invalid_values: [ "5%", "-1px", "-1", "3 5", "10px 4px", "10 2px 5in", "30px -1",

--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -5259,12 +5259,10 @@ pref("toolkit.pageThumbs.minHeight", 0);
 pref("webextensions.tests", false);
 
 // Allow customization of the fallback directory for file uploads
 pref("dom.input.fallbackUploadDir", "");
 
 // Turn rewriting of youtube embeds on/off
 pref("plugins.rewrite_youtube_embeds", true);
 
-// Is support for 'color-adjust' CSS property enabled?
-pref("layout.css.color-adjust.enabled", true);
 // Disable browser frames by default
 pref("dom.mozBrowserFramesEnabled", false);