New in version 1.5.0: The web client now supports push notifications for mentions, new followers, favourites and boosts.

Similar to mobile apps, these notifications are delivered even when you're not currently visiting mastodon.at.

To enable this feature , go to your notification settings and toggle "Push notifications". This is a per-device setting.
mastodon.at/media/lvjh9-4o2nbw

Mastodon

mastodon.at is a microblogging site that federates with most instances on the Fediverse.