Change settings in Safari on Mac
Use Safari settings to make browsing the internet work best for you.
In the Safari app on your Mac, choose Safari > Settings, then click a settings pane:
General: Change your homepage, and choose what to see when you open a window or tab, how long to keep your browsing history, which bookmarks to show in Favorites view, and where to save downloads and how long to keep them.
Tabs: Choose when to open webpages in tabs, choose to move tabs into the toolbar, select keyboard shortcuts, and select to show website icons in tabs.
AutoFill: Select to automatically fill previously saved contact information on forms, automatically enter previously saved user names and passwords when revisiting websites, and automatically enter previously saved credit card information on webpages.
Passwords: View, add, change, remove, and share the user names and passwords you’ve saved for websites.
Search: Choose the search engine you want to use when searching the web in Safari, and select how to use the Smart Search field to help with searches.
Security: Get a warning if you visit a suspected phishing website, and allow websites to use JavaScript.
Privacy: Prevent third-party content providers from tracking you across websites, and remove some or all cookies that are stored on your Mac.
Websites: For individual websites, choose to block ads, prevent videos from playing, block pop-ups, and more.
Profiles: Create and customize browsing profiles, and choose what appears when you open a new window or tab in a profile.
Extensions: Add custom controls, change the appearance of web content, and more by installing Safari extensions from the Mac App Store.
Advanced: Show full website addresses in the Smart Search field, set accessibility options, set advanced privacy options, and show features for web developers.
To learn more about the options in a pane, click the Help button 
at the bottom of the pane.