Each browser manages push notification subscriptions a little differently, but in most cases you can easily turn off push notifications aka unsubscribe or opt-out with these options:

Unsubscribe within Browser Settings

All browsers all you to unsubscribe from individual or all sites within the Browser Settings. Usually you can search for "notifications" and it will guide you to the right page. You can copy-paste the following URLs based on the browser, to get you there faster:

• Chrome: chrome://settings/content/notifications (Learn more on Chrome's docs)
• Edge: edge://settings/content/notifications (Learn more on Microsoft's docs)
• Firefox: about:preferences#privacy scroll to Permissions > Notifications > Settings (Learn more on Mozilla's docs)
• Safari: Settings > Websites > Notifications (Learn more on Safari's docs)

On these pages, just click the options to remove or block the website(s) you don't want notifications from.

Unsubscribe while on the Website

Most browsers have a "lock" or "settings" icon to the left of the URL. When on the site that sends you notifications, you can usually click these to see the Push Permissions you enabled and disable it.

If the website contains the OneSignal Bell Prompt or Custom Link prompt like the images below, you can click these to unsubscribe directly.