diff --git a/xpinstall/src/nsInstallTrigger.cpp b/xpinstall/src/nsInstallTrigger.cpp
index 5e7855e7553..3a202a13817 100644
--- a/xpinstall/src/nsInstallTrigger.cpp
+++ b/xpinstall/src/nsInstallTrigger.cpp
@@ -138,10 +138,12 @@ nsInstallTrigger::HandleContent(const char * aContentType,
         rv = aChannel->GetURI(getter_AddRefs(uri));
         if (NS_FAILED(rv)) return rv;
 
+        request->Cancel(NS_BINDING_ABORTED);                    
+
         if (uri) {    
-            char* spec;
-            uri->GetSpec(&spec);
-            if (!spec)
+            nsXPIDLCString spec;
+            rv = uri->GetSpec(getter_Copies(spec));
+            if (NS_FAILED(rv))
                 return NS_ERROR_NULL_POINTER;
 
             nsCOMPtr<nsIScriptGlobalObjectOwner> globalObjectOwner = do_QueryInterface(aWindowContext);
@@ -153,8 +155,6 @@ nsInstallTrigger::HandleContent(const char * aContentType,
                 {
                     PRBool value;
                     rv = StartSoftwareUpdate(globalObject, NS_ConvertASCIItoUCS2(spec), 0, &value);
-            
-                    nsMemory::Free(spec);
 
                     if (NS_SUCCEEDED(rv) && value) 
                         return NS_OK;