While doing research for an article in Linux Magazine, I cobbled together a simple extension for the Google Chrome and Chromium browsers. This is a one-trick pony that fetches the latest RSS articles from this very blog and displays them in a popup window.
The extension is customizable, so you can replace the default Scribbles and Snaps feed with any feed you like. You can specify the number of RSS items to display, too. You can read about the extension and download its latest release at the Scribbles and Snaps RSS page.