When viewing Safari 5’s Top Sites page, you can click on any page shown to go to the page. But if you Command+click on a page, it will open the page in a new tab or window. Go to Safari, Preferences, Tabs to change whether Command+click will open from Top Site (or any link) in a new Tab or Window. You can also set Safari to automatically switch to the new tab, while leaving the Top Sites tab still available.
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