Use keywords to search any site from the toolbar
KeySearch adds a new way of searching the internet to Safari. It uses short keywords to allow you to search any site you want, right from the toolbar. While browsing the web, just press Control-S or click the toolbar button to bring up the KeySearch bar. Then just type a keyword followed by your search query. KeySearch comes with plenty of ready-made keywords, including Google, Amazon, GMail, IMDb, Wikipedia and YouTube, and it's really easy to add your own.
Note: this extension may contain or suggest following optional features.