diff -r 000000000000 -r 6474c204b198 toolkit/components/prompts/src/SharedPromptUtils.jsm
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/components/prompts/src/SharedPromptUtils.jsm	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,42 @@
+this.EXPORTED_SYMBOLS = [ "PromptUtils" ];
+
+const Cc = Components.classes;
+const Ci = Components.interfaces;
+const Cr = Components.results;
+const Cu = Components.utils;
+
+this.PromptUtils = {
+    // Fire a dialog open/close event. Used by tabbrowser to focus the
+    // tab which is triggering a prompt.
+    // For remote dialogs, we pass in a different DOM window and a separate
+    // target. If the caller doesn't pass in the target, then we'll simply use
+    // the passed-in DOM window.
+    fireDialogEvent : function (domWin, eventName, maybeTarget) {
+        let target = maybeTarget || domWin;
+        let event = domWin.document.createEvent("Events");
+        event.initEvent(eventName, true, true);
+        let winUtils = domWin.QueryInterface(Ci.nsIInterfaceRequestor)
+                             .getInterface(Ci.nsIDOMWindowUtils);
+        winUtils.dispatchEventToChromeOnly(target, event);
+    },
+
+    objectToPropBag : function (obj) {
+        let bag = Cc["@mozilla.org/hash-property-bag;1"].
+                  createInstance(Ci.nsIWritablePropertyBag2);
+        bag.QueryInterface(Ci.nsIWritablePropertyBag);
+
+        for (let propName in obj)
+            bag.setProperty(propName, obj[propName]);
+
+        return bag;
+    },
+
+    propBagToObject : function (propBag, obj) {
+        // Here we iterate over the object's original properties, not the bag
+        // (ie, the prompt can't return more/different properties than were
+        // passed in). This just helps ensure that the caller provides default
+        // values, lest the prompt forget to set them.
+        for (let propName in obj)
+            obj[propName] = propBag.getProperty(propName);
+    },
+};