Jun 15, 2016 “In Safari 10, set to ship with macOS Sierra, Apple plans to disable common plug-ins like Adobe Flash, Java, Silverlight, and QuickTime. Step 1: On your Mac, go to Applications > Utilities, find this app 'Adobe Flash Player Install Manager'. Click to run it. Click to run it. Alternatively, you can do a quick search on Spotlight and select the 'TOP HIT' result. Since Safari 10 was introduced with macOS Sierra in 2015, Adobe's Flash Player has been disabled by default - previously you needed to disable it manually. Clearly Apple isn't prepared to leave.
Adobe Flash Player for Mac lets you access Flash content in Web sites when using browsers like OS X's Safari. The plug-in integrates seamlessly and through a preference pane, gives you control over the type of access each Web site has to your system. The only downside to using it is that it suffers from performance issues.
Pros
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Configurable: The plug-in adds a new preference pane in System Preferences where you will be able to adjust your local storage, camera, mic and peer-assisted networking settings to either allow the feature for all Web sites, on a per-request basis, or to deny all requests.
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Per-site settings: All the features listed above support per-site settings for even more precise control.
Advanced options: The app lets you delete all Flash-related data and settings as well as audio and video license files, deauthorize the computer, and access trusted locations for developer testing.
Cons
Performance issues: Despite its long history with OS X, this software tends to slow down your computer and drain your battery.
Bottom Line
If you're constantly visiting Flash-based Web sites, you will have to install either this plug-in, or a browser like Google Chrome, which has built-in Flash support. Generally, the better way to go would be to use Chrome since there will be a lower performance impact on your system. But if Chrome is not your kind of browser, then this plug-in remains a viable solution for enjoying Flash content on your Mac.