--- a/browser/components/preferences/permissions.js
+++ b/browser/components/preferences/permissions.js
@@ -125,17 +125,17 @@ var gPermissionManager = {
         principal = Services.scriptSecurityManager.createCodebasePrincipal(uri, {});
         // If we have ended up with an unknown scheme, the following will throw.
         principal.origin;
       }
     } catch (ex) {
       document.l10n.formatValues([
         ["permissions-invalid-uri-title"],
         ["permissions-invalid-uri-label"]
-      ]).then(([message, title]) => {
+      ]).then(([title, message]) => {
         Services.prompt.alert(window, title, message);
       });
       return;
     }
 
     var capabilityString = this._getCapabilityString(aCapability);
 
     // check whether the permission already exists, if not, add it