Add extensions to web apps in Safari on Mac
You can add content blockers and Safari web extensions to web apps (websites you’ve turned into apps). For example, you can turn a video website into an app, then add an extension to dim everything on your screen except the video. Or turn your favorite publication’s website into an app, then add an extension to block unwanted content.
Note: Safari app extensions are not supported in web apps.
Content blockers and Safari web extensions that are active in Safari (and have access to the same domain as the web app) are automatically turned on for the web app.
Click the web app in the Dock.
Choose [web app name] > Settings in the menu bar, then click Extensions.
Do any of the following:
Turn an extension on or off: Select or deselect the extension’s checkbox.
Change an extension’s settings: Choose the extension, then select or deselect settings.