We allow and encourage an upgrade but you cannot reverse this process. Once your users have the WebExtension installed, they will not be able to install a legacy add-on.
Mozilla 为您提供了升级的途径，也鼓励您升级，但您将无法撤销此过程。一旦您的用户安装了 WebExtension 版本，他们将无法再安装旧式附加组件。