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 Favourites 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 and select keyboard shortcuts.
AutoFill: Select to automatically fill previously saved contact information on forms, automatically enter previously saved usernames and passwords when revisiting websites, and automatically enter previously saved credit card information on web pages.
Passwords: View, add, change, remove and share the usernames 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 or a website that uses a non-secure connection, 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 customise 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.