Use Safari extensions
You can install Safari extensions to customize the way your browser works. For example, extensions can help you display social media and news buttons, block content on websites, give you access to features from other apps, and more.
Extensions may access the content of the webpages you visit. Check which extensions you have installed and make sure you’re familiar with what they do.
Tip: The Mac App Store is the safest and easiest way to discover and install extensions. The extensions are reviewed by Apple, and they update automatically when “Install app updates” is selected in App Store preferences. The extensions on safari-extensions.apple.com (the Safari Extensions Gallery) are also reviewed by Apple.
Get Safari extensions
From the Mac App Store: Open the Mac App Store, search or browse for an extension, click the button that shows the price, then click the button again to install or buy the extension.
From the Safari Extensions Gallery: Go to the Safari Extensions Gallery, then click Install Now to install the extension you want.
From third-party developers: Download the extension from the developer, then open the .safariextz file. The Safari Extensions preferences pane opens and asks you to confirm that the extension is from a trusted source. Click Trust to install the extension.
Manage your extensions
Choose Safari > Preferences, click Extensions, then do any of the following:
Turn an extension on or off: Select or deselect the extension’s checkbox.
Change an extension’s settings: Select the extension, then select or deselect settings.
Automatically update extensions you installed from the Safari Extensions Gallery: Select “Automatically update extensions from the Safari Extensions Gallery.”
Update extensions manually: When there are updates available for .safariextz-style extensions, an Updates button appears at the bottom of the Extensions list. Click Updates to see and install available updates. Extensions that came from the Mac App Store are updated when the app is updated.
Remove an extension: Select the extension, then click Uninstall. If you installed the extension from the Mac App Store, you can delete the app containing the extension and it is uninstalled automatically from Safari.
Installing or uninstalling extensions, and turning them on or off, may take effect immediately or after you go to a new webpage or refresh the current page.