--- a/dom/base/nsJSEnvironment.cpp
+++ b/dom/base/nsJSEnvironment.cpp
@@ -477,17 +477,17 @@ public:
             sameOrigin = false;
           }
         }
 
         NS_NAMED_LITERAL_STRING(xoriginMsg, "Script error.");
         if (sameOrigin) {
           init.mMessage = mErrorMsg;
           init.mLineno = mLineNumber;
-          init.mColumn = mColumn;
+          init.mColno = mColumn;
           init.mError = mError;
         } else {
           NS_WARNING("Not same origin error!");
           init.mMessage = xoriginMsg;
           init.mLineno = 0;
         }
 
         nsRefPtr<ErrorEvent> event =

--- a/dom/events/JSEventHandler.cpp
+++ b/dom/events/JSEventHandler.cpp
@@ -137,17 +137,17 @@ JSEventHandler::HandleEvent(nsIDOMEvent*
 
       scriptEvent->GetFilename(file);
       fileName = &file;
 
       lineNumber.Construct();
       lineNumber.Value() = scriptEvent->Lineno();
 
       columnNumber.Construct();
-      columnNumber.Value() = scriptEvent->Column();
+      columnNumber.Value() = scriptEvent->Colno();
 
       ThreadsafeAutoJSContext cx;
       error.Construct(cx);
       error.Value() = scriptEvent->Error(cx);
     } else {
       msgOrEvent.SetAsEvent() = aEvent->InternalDOMEvent();
     }
 

--- a/dom/events/test/test_error_events.html
+++ b/dom/events/test/test_error_events.html
@@ -32,17 +32,17 @@
     [ "Event filename", errorEvent.filename, location.href ],
     [ "Callback filename", file, location.href ],
     [ "Event line number", errorEvent.lineno, 27 ],
     [ "Callback line number", line, 27 ],
     [ "Event message", errorEvent.message, "Error: hello" ],
     [ "Callback message", msg, "Error: hello" ],
     [ "Event error-object", errorEvent.error, thrown],
     [ "Callback error-object", error, thrown ],
-    [ "Event column", errorEvent.column, 0 ], // Sadly not correct right now
+    [ "Event column", errorEvent.colno, 0 ], // Sadly not correct right now
     [ "Callback column", column, 0 ]
   ]);
 </script>
 <script>
   var workerLocation = location.protocol + "//" + location.host +
     location.pathname.replace("test_error_events.html", "error_event_worker.js");
   var eventFileTest = async_test("Worker event filename");
   var eventLineTest = async_test("Worker event line number");

--- a/dom/webidl/ErrorEvent.webidl
+++ b/dom/webidl/ErrorEvent.webidl
@@ -4,20 +4,20 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 [Constructor(DOMString type, optional ErrorEventInit eventInitDict)]
 interface ErrorEvent : Event
 {
   readonly attribute DOMString message;
   readonly attribute DOMString filename;
   readonly attribute unsigned long lineno;
-  readonly attribute unsigned long column;
+  readonly attribute unsigned long colno;
   readonly attribute any error;
 };
 
 dictionary ErrorEventInit : EventInit
 {
   DOMString message = "";
   DOMString filename = "";
   unsigned long lineno = 0;
-  unsigned long column = 0;
+  unsigned long colno = 0;
   any error = null;
 };

--- a/dom/workers/WorkerPrivate.cpp
+++ b/dom/workers/WorkerPrivate.cpp
@@ -3142,17 +3142,17 @@ WorkerPrivateParent<Derived>::BroadcastE
     }
 
     RootedDictionary<ErrorEventInit> errorInit(aCx);
     errorInit.mBubbles = false;
     errorInit.mCancelable = true;
     errorInit.mMessage = aMessage;
     errorInit.mFilename = aFilename;
     errorInit.mLineno = aLineNumber;
-    errorInit.mColumn = aColumnNumber;
+    errorInit.mColno = aColumnNumber;
 
     nsRefPtr<ErrorEvent> errorEvent =
       ErrorEvent::Constructor(sharedWorker, NS_LITERAL_STRING("error"),
                               errorInit);
     if (!errorEvent) {
       Throw(cx, NS_ERROR_UNEXPECTED);
       JS_ReportPendingException(cx);
       continue;

--- a/dom/workers/test/test_sharedWorker.html
+++ b/dom/workers/test/test_sharedWorker.html
@@ -52,17 +52,17 @@
             receivedMessage = event.data;
           };
 
           worker.onerror = function(event) {
             ok(event instanceof ErrorEvent, "Got an ErrorEvent");
             is(event.message, "Error: " + sentMessage, "Got correct error");
             is(event.filename, errorFilename, "Got correct filename");
             is(event.lineno, errorLine, "Got correct lineno");
-            is(event.column, errorColumn, "Got correct column");
+            is(event.colno, errorColumn, "Got correct column");
             ok(receivedMessage !== undefined, "Got message already");
             ok(receivedError === undefined, "Haven't gotten error yet");
             receivedError = event.message;
             event.preventDefault();
             SimpleTest.finish();
           };
 
           worker.port.postMessage(sentMessage);