I'm working on a new Chrome extension now (mainly as an excuse to avoid writing this article I'm supposed to turn in), and ran into an interesting problem. I was making use of console.log to debug the extension and noticed it didn't show up in the main console. I figured that made some sense. A user may have a bunch of extensions and you wouldn't want them adding noise to your console. However, I saw examples of extensions that made use of the console so I figured they had to show up somewhere.
This tutorial on the Chrome Extensions site mentioned right clicking on your extension icon and selecting "Inspect popup". But my extension didn't have an UI and that option wasn't available. I then noticed something on the Extensions page:
See the link by "Inspect views"? Clicking that fires up a Developer Tools window just for your extension. It's like Chrome was smart enough to recognize that there wasn't a real background page and generated one for you.