在弹出页面时，不能使用 onClicked 方法. Google文档.

You can't use the onClicked method when you have a popup page. Google docs.

onClicked:单击浏览器操作图标时触发.此事件不会触发如果浏览器操作有弹出窗口.

onClicked: Fired when a browser action icon is clicked. This event will not fire if the browser action has a popup.

如果您想同时保留两者，请考虑编写一个内容脚本.

If you want to keep both consider writing a content script.