This is the code for a Chrome extension that helps you preview how fonts from the Google Fonts API look on existing webpages. The "testing" process is: - Open a webpage, try to apply a font, try to change the style, try to apply a different font, try to reset, try to apply another. - Good webpages are: http://en.wikipedia.org/wiki/Fox (Basics) http://www.mysparebrain.com/svgjs (Tests SVG issue) If you have ideas for improvements, please send a pull request.