Apple has released Safari 12 for macOS 10.12.6 Sierra and 10.13.6 High Sierra with the same new features and under-the-hood changes that will be included in the upcoming release of 10.14 Mojave. The new version of Apple’s Web browser gains the capability to display Web site icons on tabs, adds support for allowing or blocking pop-ups on specific Web sites, and automatically suggests and fills a strong, unique password when creating an account or changing a password.
Safari 12 also makes some big changes to how it interacts with extensions. It now automatically turns off Safari extensions that hurt browsing performance and discontinues support for extensions that have been signed only by developers (and not reviewed by Apple) and most NPAPI plug-ins. At the Eclectic Light Company, Howard Oakley has a more in-depth look at the changes. If you rely on Safari extensions, Jason Snell shares a workaround that lets you run disabled extensions.
On the security side, Safari 12 addresses a logic issue that could allow a malicious Web site to exfiltrate auto-filled data and improves data deletion to ensure clearing a history item actually clears visits with redirect chains. Safari 12 is available only via Software Update. (Free, release notes, macOS 10.12.6 and 10.13.6)