4 files changed, 6 insertions, 1 deletions
diff --git a/layout/style/nsCSSProps.cpp b/layout/style/nsCSSProps.cpp
index 289a16ecd..ac2978c27 100644
--- a/layout/style/nsCSSProps.cpp
+++ b/layout/style/nsCSSProps.cpp
@@ -2189,6 +2189,8 @@ const KTableEntry nsCSSProps::kUserFocusKTable[] = {
 
 const KTableEntry nsCSSProps::kUserInputKTable[] = {
   { eCSSKeyword_none,     StyleUserInput::None },
+  { eCSSKeyword_enabled,  StyleUserInput::Enabled },
+  { eCSSKeyword_disabled, StyleUserInput::Disabled },
   { eCSSKeyword_auto,     StyleUserInput::Auto },
   { eCSSKeyword_UNKNOWN,  -1 }
 };
diff --git a/layout/style/nsStyleConsts.h b/layout/style/nsStyleConsts.h
index 5412eed26..6d207aec9 100644
--- a/layout/style/nsStyleConsts.h
+++ b/layout/style/nsStyleConsts.h
@@ -241,6 +241,8 @@ enum class StyleUserSelect : uint8_t {
 // user-input
 enum class StyleUserInput : uint8_t {
   None,
+  Enabled,
+  Disabled,
   Auto,
 };
 
diff --git a/layout/style/res/forms.css b/layout/style/res/forms.css
index 95025221d..e7566e183 100644
--- a/layout/style/res/forms.css
+++ b/layout/style/res/forms.css
@@ -425,6 +425,7 @@ optgroup:disabled,
 select:disabled:disabled /* Need the pseudo-class twice to have the specificity
                             be at least the same as select[size][multiple] above */
 {
+  -moz-user-input: disabled;
   color: GrayText;
   background-color: ThreeDLightShadow;
   cursor: inherit;
diff --git a/layout/style/test/property_database.js b/layout/style/test/property_database.js
index 3486d15d0..c75f7b498 100644
--- a/layout/style/test/property_database.js
+++ b/layout/style/test/property_database.js
@@ -2203,7 +2203,7 @@ var gCSSProperties = {
     inherited: true,
     type: CSS_TYPE_LONGHAND,
     initial_values: [ "auto" ],
-    other_values: [ "none" ],
+    other_values: [ "none", "enabled", "disabled" ],
     invalid_values: []
   },
   "-moz-user-modify": {