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If you use another browser such as Chrome, the same option is in the share menu.

This option is available in Safari on macOS Sonoma and later.

Click the install icon on the right of the address bar; if you don't see it, choose Install app or Install this site as an app from the browser menu.
Click Install in the window that opens.

If the app is already installed, you can open it from the Start menu, the Dock or your app list.

The desktop version of Firefox doesn't support installing sites as apps. Open the site in Chrome, Edge or Safari and use this button again.