Apple has released Safari 12 for macOS Sierra and macOS High Sierra. It’s available for download at the Mac App Store.
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According to Apple, Safari 12 offers “improvements to privacy, compatibility, and security.” Specifically, it:
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Adds the ability to view website icons in tabs;
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Automatically suggested and fills in a strong, unique password when creating an account or changing a password;
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Flags reused passwords in Safari preferences;
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Adds support for allowing or blocking pop-ups on specific websites;
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Prevents embedded content and social media buttons from tracking cross-site browsing without permission;
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Suppresses ad retargeting by reducing advertisers’ ability to identify Mac devices uniquely;
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Automatically turns off Safari extensions that negatively impact browsing performance;
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Improves security by only supporting legacy Safari Extensions that have been reviewed by Apple;
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Improves security by discontinuing support for most NPAPI plug-ins.