MacOS Big Sur
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macOS Big Sur is the seventeenth major release of macOS, Apple's operating system for Macintosh computers. It was announced at Apple's Worldwide Developers Conference (WWDC) on June 22, 2020, and was released to the public on November 12, 2020.
The Mac App Store showing the Safari Extensions category
Safari (web browser)
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Safari is a web browser developed by Apple. It is built into Apple's operating systems, including macOS, iOS, iPadOS and visionOS, and uses Apple's open-source browser engine WebKit, which was derived from KHTML.
Safari 6 ceased support for Windows users, and it was subsequently removed from Microsoft's browser-choice menu (pictured).