Safari 12 is recommended for all macOS High Sierra users and can be downloaded from the Software Update function in the Mac App Store.
Safari 12 brings support for creating and storing strong, unique passwords, flagging reused passwords in Safari Preferences, preventing social media buttons and embedded content from tracking you across websites, and suppressing ad retargeting by limiting the amount of information available about your Mac.
Apple's full release notes for the update are below:
The Safari 12 update is recommended for all macOS High Sierra users and contains improvements to privacy, compatibility, and security. This update:The update also includes several fixes for security vulnerabilities, outlined in an Apple support document on the security content of Safari 12.
- Adds the ability to view website icons in tabs
- Automatically suggests and fills a strong, unique password when creating an account or changing a password
- Flags reused passwords in Safari Preferences
- Adds support for allowing or blocking pop-ups on specific websites
- Prevents embedded content and social media buttons from tracking cross-site browsing without permission.
- Suppresses ad retargeting by reducing advertisers' ability to identify Mac devices uniquely
- Automatically turns off Safari extensions that negatively impact browsing performance
- Improves security by only supporting legacy Safari Extensions that have been reviewed by Apple
- Improves security by discontinuing support for most NPAPI plug-ins
macOS Mojave with Safari 12 built in will be released to the public on Monday, September 24.