When I downloaded Safari 5 today, I noticed that apple finally added support for extensions into the browser! Safari has always been a nice app to use on mac, and I love the inspector, but lack of safari extensions for things such as grid tools, color selectors, etc have made me reluctant to switch. However, Safari also made it far easier than many other browsers to create extensions using straight up HTML5, CSS and JS! So in about an hour, I created this little extension to overlay a grid (like 960 or Blueprint) on the page. Enjoy!