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Release notes accompanying the Safari 13 download on Mac are as follows: You will need to quit out of Safari if it’s currently running before it can be installed on a Mac. If you want to install Safari 13 but avoid installing some other software update(s), you may recall that it’s easy to selectively install specific software updates in macOS as covered here. Mac users running the latest versions of macOS Mojave or macOS High Sierra can find Safari 13 available to download now from the Software Update section of System Preferences (Mojave), or the Updates section of the Mac App Store (High Sierra). The full release notes for Safari 13 are included further below. Additionally, there are some new features in Safari 13 that may be useful, including quicker access to Picture in Picture mode, improved tab searching, and an updated start page. Safari 13 includes improvements to privacy, security, and compatibility, and is therefore recommended to install for all Mac users.
