New-look Extensions store
The place to go to add functionality to Safari
You can expand and tailor your Safari experience still further with extensions. These provide extra functionality to your Safari interface and now have their own special section in the mac app Store. To access them, while in Safari, click on the ‘Safari’ menu item and choose ‘Safari Extensions’. You will then be directed to the apple Safari Extensions website where you can click a link to access the Extensions section within the app Store app.