关闭由Google Chrome扩展程序创建的弹出窗口

I'm trying to create a Chrome extension that is a replacement for the Delicious bookmarklet. I know there's already an extension that does it, but the problem with that extension is that after you bookmark a site, the popup window stays open (as opposed to using the bookmarklet, where the popup closes itself after submitting the form. I recreated the extension and ran into the same problem. I'm trying to create a Chrome extension that is