code: function _setMenuItemsVisible() {
          var file = MainViewManager.getCurrentlyViewedFile(MainViewManager.ACTIVE_PANE),
              cMenuItems = [Commands.FILE_SAVE, Commands.FILE_RENAME, Commands.NAVIGATE_SHOW_IN_FILE_TREE, Commands.NAVIGATE_SHOW_IN_OS],
              // Enable menu options when no file is present in active pane
              enable = !file || (file.constructor.name !== "RemoteFile");
          
              // Enable or disable commands based on whether the file is a remoteFile or not.
              cMenuItems.forEach(function (item) {
                  CommandManager.get(item).setEnabled(enable);
              });
      }
docs: Disable context menus which are not useful for remote file