PopSearch Safari
Extension

PopSearch Safari Extension lets you easily add any search engine you like to Safari. If you use Safari 6, you can even access your custom search engines right in the combined address/search bar by typing short keywords like "w" for Wikipedia before your search terms. Otherwise, simply use the convenient popup search bar by typing Command-K or another hotkey of your choosing.

Features:

• It's easy to add other search engines to the built-in ones. You just need to enter a search URL--or let the Engine Wizard figure it out from a search results page.
• You can use short keywords to select a search engine in the popup search bar or Safari 6's address bar.
• The popup search bar can show Google search suggestions as you type a query, or it can remember your recent search queries and show you a list of ones that match what you type in the input box. If you're repeating a recent search, just select an item in the menu and press Enter.
• If you select some text on the current page before pressing the hotkey, that text will be automatically entered into the popup search bar.
• You can export (back up) your search engines to Pinboard or Delicious, and import (restore) them from Pinboard or Delicious to PopSearch on the same computer or another one.

• Popsearch will no longer handle address bar searches that are not prefixed with a search engine keyword