Google Chrome's Pin Tab feature shrinks any tab down to only a web site's favicon to save precious tab bar real estate—no extension required.

In August we detailed how to set up space-saving, icon-only tabs in Firefox so you've always got quick access to your most-used webapps (like Gmail and Google Reader) without wasting a lot of tab bar real estate. The FaviconizeTab Firefox extension is the secret sauce to that setup, allowing you to shrink any tab down to just the site's favicon (the small icon image already in the tab); in the most recent dev channel releases of Chrome, you get the same functionality without needing to install anything. Here's how it works: