--- a/dom/apps/src/Webapps.js
+++ b/dom/apps/src/Webapps.js
@@ -744,17 +744,17 @@ WebappsApplicationMgmt.prototype = {
           let event = new this._window.MozApplicationEvent("applicationinstall",
                            { application : createApplicationObject(this._window, app) });
           this._oninstall.handleEvent(event);
         }
         break;
       case "Webapps:Uninstall:Return:OK":
         if (this._onuninstall) {
           let event = new this._window.MozApplicationEvent("applicationuninstall",
-                           { application : createApplicationObject(this._window, msg) });
+                           { application : createApplicationObject(this._window, { origin: msg.origin }) });
           this._onuninstall.handleEvent(event);
         }
         break;
     }
     this.removeRequest(msg.requestID);
   },
 
   classID: Components.ID("{8c1bca96-266f-493a-8d57-ec7a95098c15}"),

--- a/dom/apps/src/Webapps.jsm
+++ b/dom/apps/src/Webapps.jsm
@@ -1503,17 +1503,17 @@ this.DOMApplicationRegistry = {
 
   uninstall: function(aData, aMm) {
     for (let id in this.webapps) {
       let app = this.webapps[id];
       if (app.origin != aData.origin) {
         continue;
       }
 
-      if (!app.removable)
+      if (!this.webapps[id].removable)
         return;
 
       // Clean up the deprecated manifest cache if needed.
       if (id in this._manifestCache) {
         delete this._manifestCache[id];
       }
 
       // Clear private data first.
@@ -1534,21 +1534,17 @@ this.DOMApplicationRegistry = {
       let dir = this._getAppDir(id);
       try {
         dir.remove(true);
       } catch (e) {}
 
       delete this.webapps[id];
 
       this._saveApps((function() {
-        let detail = {
-          manifestURL: app.manifestURL,
-          origin: aData.origin
-        };
-        this.broadcastMessage("Webapps:Uninstall:Return:OK", detail);
+        this.broadcastMessage("Webapps:Uninstall:Return:OK", aData);
         Services.obs.notifyObservers(this, "webapps-sync-uninstall", appNote);
         this.broadcastMessage("Webapps:RemoveApp", { id: id });
       }).bind(this));
 
       return;
     }
 
     aMm.sendAsyncMessage("Webapps:Uninstall:Return:KO", aData);
@@ -1736,25 +1732,23 @@ this.DOMApplicationRegistry = {
           continue;
 
         // Clean up the deprecated manifest cache if needed.
         if (record.id in this._manifestCache) {
           delete this._manifestCache[record.id];
         }
 
         let origin = this.webapps[record.id].origin;
-        let manifestURL = this.webapps[record.id].manifestURL;
         delete this.webapps[record.id];
         let dir = this._getAppDir(record.id);
         try {
           dir.remove(true);
         } catch (e) {
         }
-        this.broadcastMessage("Webapps:Uninstall:Return:OK", { origin: origin,
-                                                               manifestURL: manifestURL });
+        this.broadcastMessage("Webapps:Uninstall:Return:OK", { origin: origin });
       } else {
         if (this.webapps[record.id]) {
           this.webapps[record.id] = record.value;
           delete this.webapps[record.id].manifest;
         } else {
           let data = { app: record.value };
           this.confirmInstall(data, true);
           this.broadcastMessage("Webapps:Install:Return:OK", data);