Note: While Ruffle works as a browser extension, Safari has stricter extension rules than Chrome or Firefox. It is often easier to use the Ruffle-enabled web interface or switch to a browser like Firefox or Chrome to use the Ruffle extension more reliably.
I can't get flash player to work in Safari. - Adobe Community enable flash player safari
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. Note: While Ruffle works as a browser extension,
defaults write com.apple.Safari WebKitPluginsEnabled -bool true defaults write com.apple.Safari WebKitPluginsEnabledForNonStandardFrameLoads -bool true - Adobe Community Safari historically used the to
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