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Review Mozilla 1225110: Support notification actions

🔍 Bugzilla Audit

Bugzilla: https://bugzilla.mozilla.org/show_bug.cgi?id=1225110

Description

Nightly-only in ESR 140, controlled by dom.webnotifications.actions.enabled.

Exposes Notification.actions and Notification.maxActions properties.

The latter is a user-agent defined property, that is meant to represent the platform capabilities. This is currently hard coded to 2 to prevent fingerprinting, but there is a WHATWG issue discussing the fingerprinting issue and possibly exposing the platform number with user permission.

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