diff --git a/b2g/chrome/content/shell.js b/b2g/chrome/content/shell.js
index b0f5768efe4..b81b1ff2e5b 100644
--- a/b2g/chrome/content/shell.js
+++ b/b2g/chrome/content/shell.js
@@ -722,6 +722,7 @@ var WebappsHelper = {
       return;
 
     let installer = this._installers[detail.id];
+    delete this._installers[detail.id];
     switch (detail.type) {
       case "webapps-install-granted":
         DOMApplicationRegistry.confirmInstall(installer);
diff --git a/dom/apps/src/Webapps.js b/dom/apps/src/Webapps.js
index 0e0b9f9c090..afea4971f99 100644
--- a/dom/apps/src/Webapps.js
+++ b/dom/apps/src/Webapps.js
@@ -134,9 +134,9 @@ WebappsRegistry.prototype = {
                                                             etag: etag,
                                                             receipts: receipts,
                                                             categories: categories },
-                                                            from: installURL,
-                                                            oid: this._id,
-                                                            requestID: requestID });
+                                                     from: installURL,
+                                                     oid: this._id,
+                                                     requestID: requestID });
         }
       } else {
         Services.DOMRequest.fireError(request, "MANIFEST_URL_ERROR");