Keystone added custom keyword searches to Safari, allowing simple queries such as "wiki Mac OS X" to be entered directly into the address bar. Unfortunately, it was never updated for Safari 6, and was made obsolete with introduction of "Quick Website Search" in OS X Yosemite.
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Keystone 1.1.2
for Safari 4/5 on
Mac OS X v10.5 and later -
Keystone 1.0
for Safari 4
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Keystone 1.1 (source)
requires Xcode 3.1
