"Rosetta 2 enables a Mac with Apple silicon to use apps built for a Mac with an Intel processor.
In the example above, a reason Safari would need the option checked is if it's using a non-universal extension.
Click Install, then enter your user name and password to allow installation to proceed. Rosetta will then be available for any of your apps that need it.
Rosetta 2 works in the background whenever you use an app built only for Mac computers with an Intel processor. It automatically translates the app for use with Apple silicon.
In most cases, you won't notice any difference in the performance of an app that needs Rosetta. But you should contact the app developer to inquire about a version that can natively use the full power and performance of Apple silicon.
You can use Get Info to identify apps that need Rosetta or can use Rosetta:
The Info window for universal apps includes the setting "Open using Rosetta." It enables email apps, web browsers, and other apps to use add-ons that haven't been updated to support Apple silicon. If an app doesn't recognize a plug-in, extension, or other add-on, quit the app, select this setting, and try again."
- Select the app in the Finder.
- From the File menu in the menu bar, choose Get Info.
- View the information labeled Kind:
- Application (Intel) means the app supports only Intel processors and needs Rosetta to work on any Mac with Apple silicon.
- Application (Universal) means the app supports both Apple silicon and Intel processors, and uses Apple silicon by default.