This guide applies to both Mac and Windows versions of Firefox, although screenshots are from Windows.
Navigate to www.cuil.com in your browser.
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Click the arrow on the left-hand side of the search box. It will have a blue glow around it. Select "Add 'Cuil'" from the list.

Cuil will now appear as the default search engine in the search box.
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Make Cuil the default search engine in your favorite browser.
Don’t see your browser here? Let us know