Here are some options for browsing in tabs:
To view the tab bar, if it’s hidden: Choose View > Show Tab Bar.
The tab bar is visible as long as you have multiple tabs open. You can hide the tab bar if only a single tab is open.
To open a webpage as a tab: Press the Command key while you click the Back or Forward buttons or a link on a webpage.
You can also open the bookmarks list as a tab by Command-clicking the open-book icon.
To open multiple bookmarks in tabs: Click the open-book icon, select the bookmarks you want to open, and then press the Space bar.
To open a folder of bookmarks as a set of tabs from the bookmarks bar, click the open-book icon, click Bookmarks Bar in the left column, and then select the Auto-Click checkbox next to the folder’s name.
To rearrange tabs: Drag them back and forth in the tab bar.
To move a tab to a new window: Choose Window > “Move Tab to New Window.”
You can also move a tab to a window by positioning the pointer over the tab and then holding down the mouse button while you drag the tab to the desktop or to another Safari window.
To combine several Safari windows into a single window with multiple tabs: Choose Window > Merge All Windows.
To bookmark a set of tabs: Choose Bookmarks > Add Bookmarks For These Tabs.
The bookmarks are placed in a Saved Tabs folder in the bookmarks bar.
To close a tab: Click the X button.