Chromed Firefox

Name: Chromifox
Description: A coat of Chrome for Firefox. Chromifox is a bright and soft blue theme for Firefox on Windows, Linux, and Mac OS X, inspired by the appearance of the Google Chrome browser and its open-source roots, Chromium.

By installing this theme in your Firefox, your Firefox will be looked like Google Chrome. But, the Chromifox's tabbar is below the address bar.

And there is an extension that is available to change your Firefox appearance. This extension is called ChromiGlass and it requires Chromifox as a basic. Its tabbar is above the address bar.

Name: ChromiGlass
Description: Polishes the Chrome for Chromifox.

However, the ChromiGlass is only available for Windows Vista. A mozilla account is required when download this extension too!