Safari has received many new features in macOS Monterey and iOS 15. On the Mac, the tab design has been given a major makeover. The tabs are part of the address bar and the top part also changes color with the design of the website. But macOS Monterey isn't out yet. Still, you can already try the improvements with Safari 15 for macOS Big Sur and macOS Catalina.
Safari 15 available for macOS Big Sur and Catalina
If you can't get used to the new tabs after installing the update, you can change the display of Safari tabs. You can choose between a compact view, where the tabs are on the same line as the address bar, or the separate view. If you prefer a design more similar to Safari 14, choose Separate.
The tab groups are also new in Safari 15. This allows you to combine multiple tabs with each other. For example, think of a series of tabs for your work or a collection of tabs for private. These tab groups also sync with the iPhone and iPad in iOS 15.
Here are the full release notes for Safari 15 for Mac:
Safari
Safari 15 offers faster performance, improved security and the following new features:

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- Tab groups help you store and organize your tabs and access them easily across devices
- Redesigned tabs have a rounder and more pronounced appearance and take the color of the web page about
- The option for a compact tab bar shows more of your web page on the screen
- ‘Upgrade to HTTPS’ automatically switches sites from HTTP to the more secure HTTPS, if available
More information about the security aspects of this update can be found at: https://support.apple.com/HT201222.
Installing the update is very easy. Go to System Preferences > Software update and the latest version will appear automatically.