Enable Flash Player Safari [updated] Jun 2026

If you are running an older macOS (High Sierra, Mojave, or early Catalina) with , you may still have the legacy plugin option.

Safari historically used the to run Flash. Modern WebKit replaces NPAPI with WebKit Plugins (deprecated) and now exclusively uses HTML5/JavaScript. Flash circumvents the WKWebView sandbox, posing a high risk for remote code execution (RCE). Therefore, enabling it requires lowering security parameters. enable flash player safari

If you are on an older OS (like macOS High Sierra or Mojave) that still supports the plugin, follow these steps: Using the Flash Player In Safari - MacMost.com If you are running an older macOS (High

Since native support is gone, you must use external tools to run Flash content: or early Catalina) with

Note: These keys are undocumented and reset after Safari updates.