Using Safari's Tabbed Browsing in Mac OS X
Safari offers tabbed browsing, which many folks use to display (and organize) multiple Web pages at one time. For example, if you're doing a bit of comparison shopping for a new piece of hardware between different online stores, tabs are ideal.
When you hold down the Command key and click a link or bookmark using tabs, a tab representing the new page appears under the Bookmarks bar. Just click the tab to switch to that page. (If you don't hold down Command, things revert to business as usual, and Safari replaces the contents of the window with the new page.) Figure 1 illustrates a number of pages opened in Safari using tabs.
To turn on tabbed browsing, choose Safari --> Preferences to display the Preferences dialog box; then click Tabs. From here, select the Enable Tabbed Browsing check box to turn on tabs.
Done with a page? You can remove a tabbed page by clicking the X button next to the tab's title.