Starting with macOS Sonoma, you can use Safari to save any webpage as a web app, so that you can use it independently of Safari. Web apps offer a streamlined, app-like experience and easy access from the Dock.

For Microsoft Edge browser you have always been able to click the ellipsis (...) in the top-right, then choose Apps > Install as app

Tested with the following webmails:

• Microsoft Outlook
• Plesk Premium Email
• SmarterMail
• Gmail

Basic concept: Go to your webmail in a browser, then install as an app (PWA; Progressive Web App). The app can then be used from the desktop like any other app, without needing to open a browser.

How to create a web app on a Mac

• In Safari, open the webpage that you want to use as a web app.
• From the menu bar, choose File > Add to Dock. Or click the Share buttonShare button in the Safari toolbar, then choose Add to Dock.
• Type the name that you want to use for the web app, then click Add. The web app is saved to the Applications folder of your home folder, and you can open it from the Dock, Launchpad, or Spotlight.