diff --git a/content/events/test/test_all_synthetic_events.html b/content/events/test/test_all_synthetic_events.html
index 82b8979ae3d2..a99ea23b0116 100644
--- a/content/events/test/test_all_synthetic_events.html
+++ b/content/events/test/test_all_synthetic_events.html
@@ -353,17 +353,14 @@ const kEventConstructors = {
   StyleRuleChangeEvent:                      { create: function (aName, aProps) {
                                                          return new StyleRuleChangeEvent(aName, aProps);
                                                        },
-                                               chromeOnly: true,
                                              },
   StyleSheetApplicableStateChangeEvent:      { create: function (aName, aProps) {
                                                          return new StyleSheetApplicableStateChangeEvent(aName, aProps);
                                                        },
-                                               chromeOnly: true,
                                              },
   StyleSheetChangeEvent:                     { create: function (aName, aProps) {
                                                          return new StyleSheetChangeEvent(aName, aProps);
                                                        },
-                                               chromeOnly: true,
                                              },
   SVGZoomEvent:                              { create: function (aName, aProps) {
                                                          var e = document.createEvent("svgzoomevent");
@@ -413,16 +410,6 @@ const kEventConstructors = {
                                              },
 };
 
-for (var name of Object.keys(kEventConstructors)) {
-  if (!kEventConstructors[name].chromeOnly) {
-    continue;
-  }
-  if (window[name]) {
-    ok(false, name + " should be chrome only.");
-  }
-  window[name] = SpecialPowers.unwrap(SpecialPowers.wrap(window)[name]);
-}
-
 var props = Object.getOwnPropertyNames(window);
 for (var i = 0; i < props.length; i++) {
   // Assume that event object must be named as "FooBarEvent".
diff --git a/dom/tests/mochitest/general/test_interfaces.html b/dom/tests/mochitest/general/test_interfaces.html
index 909fdba5395c..76ddffce663d 100644
--- a/dom/tests/mochitest/general/test_interfaces.html
+++ b/dom/tests/mochitest/general/test_interfaces.html
@@ -411,7 +411,10 @@ var interfaceNamesInGlobalScope =
     {name: "SpecialPowers", xbl: false},
     "Storage",
     "StorageEvent",
+    "StyleRuleChangeEvent",
     "StyleSheet",
+    "StyleSheetApplicableStateChangeEvent",
+    "StyleSheetChangeEvent",
     "StyleSheetList",
     "SVGAElement",
     "SVGAltGlyphElement",
diff --git a/dom/webidl/StyleRuleChangeEvent.webidl b/dom/webidl/StyleRuleChangeEvent.webidl
index 4bce6b76e574..1e211edddf9e 100644
--- a/dom/webidl/StyleRuleChangeEvent.webidl
+++ b/dom/webidl/StyleRuleChangeEvent.webidl
@@ -5,7 +5,7 @@
  */
 interface CSSRule;
 
-[ChromeOnly, Constructor(DOMString type, optional StyleRuleChangeEventInit eventInitDict), HeaderFile="GeneratedEventClasses.h"]
+[Constructor(DOMString type, optional StyleRuleChangeEventInit eventInitDict), HeaderFile="GeneratedEventClasses.h"]
 interface StyleRuleChangeEvent : Event
 {
   readonly attribute CSSStyleSheet? stylesheet;
diff --git a/dom/webidl/StyleSheetApplicableStateChangeEvent.webidl b/dom/webidl/StyleSheetApplicableStateChangeEvent.webidl
index 8aa4474e6321..483a386cdf7d 100644
--- a/dom/webidl/StyleSheetApplicableStateChangeEvent.webidl
+++ b/dom/webidl/StyleSheetApplicableStateChangeEvent.webidl
@@ -4,7 +4,7 @@
  * You can obtain one at http://mozilla.org/MPL/2.0/.
  */
 
-[ChromeOnly, Constructor(DOMString type, optional StyleSheetApplicableStateChangeEventInit eventInitDict), HeaderFile="GeneratedEventClasses.h"]
+[Constructor(DOMString type, optional StyleSheetApplicableStateChangeEventInit eventInitDict), HeaderFile="GeneratedEventClasses.h"]
 interface StyleSheetApplicableStateChangeEvent : Event
 {
   readonly attribute CSSStyleSheet? stylesheet;
diff --git a/dom/webidl/StyleSheetChangeEvent.webidl b/dom/webidl/StyleSheetChangeEvent.webidl
index d35651a3382c..b6019d83145d 100644
--- a/dom/webidl/StyleSheetChangeEvent.webidl
+++ b/dom/webidl/StyleSheetChangeEvent.webidl
@@ -4,7 +4,7 @@
  * You can obtain one at http://mozilla.org/MPL/2.0/.
  */
 
-[ChromeOnly, Constructor(DOMString type, optional StyleSheetChangeEventInit eventInitDict), HeaderFile="GeneratedEventClasses.h"]
+[Constructor(DOMString type, optional StyleSheetChangeEventInit eventInitDict), HeaderFile="GeneratedEventClasses.h"]
 interface StyleSheetChangeEvent : Event
 {
   readonly attribute CSSStyleSheet? stylesheet;