Spew is a minimalist firefox extension that lets the browser do all the heavy lifting. All it does is crawl feeds in the background so you can read their stories as they come in. Wanna add a feed? Just bookmark it into the 'Feeds' folder. Wanna import all your google reader feeds? There's an upload button in the addon toolbar. Wanna read some stories? Look in the 'Feed items' bookmark folder, or just hit ctrl-shift-o (configurable) to open a few stories in tabs.
You'll need the addon SDK. Don't worry, it's super easy to install. Email me if you run into trouble or would like a binary to install: spew@akkartik.com
$ git clone http://github.com/akkartik/spew
$ cd spew
$ cfx xpi
This creates a file called spew.xpi. Drag it to your browser. You're all set!