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→Sessions
=== Sessions ===
Sessions are essentially scopes. They are meant to give context to events; this allows events to be simpler and more simple and reusable. Sessions are usually bound to some component of the UI, some user action with a duration, or some transient state.
For example, a session might be begun when a user begins interacting with the UI component, and stopped when the interaction ends. They Or a session might encapsulate period of no network connectivity, the first five seconds after the browser launched, the time spent with an active download, or a guest mode session. Sessions implicitly record the duration of the interaction.
A simple use-case for sessions is the bookmarks panel in about:home. We start a session when the user swipes into the panel, and stop it when they swipe away. This bookmarks session does two things: firstly, it gives scope to any generic event that may occur within the panel (e.g., loading a URL). Secondly, it allows us to figure out how much time users are spending in the bookmarks panel.
