Latest Development
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How to use the theme
→ Install as a userscript for Firefox with Greasemonkey, Opera, Google Chrome (Nightly Build only) or any Webkit browser (Safari, Omniweb etc.) with GreaseKit installed. I also recommend installing the Show Feed Favicons userscript to add the final touches.
The Helvetireader user script is ideal for using with Fluid.app (Here's how) or Mozilla Prism to create a standalone application. There's even a Fluid App Icon you can use.
Just the CSS
If you use a browser that doesn't support userscripts, or you want to customise it, download the CSS file. Camino users, please see the setup instructions. For general instructions on how to apply custom CSS to a site, read this post on Hicksdesign