Firefox/Projects/Restore Visible Tabs First

Overview

Sprint lead: zpao
Sprinters: dietrich, connor

Description

When restoring a session, we should prioritize the tabs that are visible on the tabstrip over the ones that are in the background.

Goals / Use Cases

• "Speed up" start-up - at least it would seem so the users
• Make pages last used more immediately available, again making it seem to the users that we're starting up faster.

Non Goals

• We aren't trying to actually improve start up.

Design

At shutdown:

1. Identify visible tabs in each window
2. Set a flag in the JSON for each tab

At startup:

1. Set the priority of those identified visible tabs to be higher

Bugs

The bug:

• https://bugzilla.mozilla.org/show_bug.cgi?id=480148

In the "non goals" arena, but might have some valuable discussion:

• https://bugzilla.mozilla.org/show_bug.cgi?id=402768
• https://bugzilla.mozilla.org/show_bug.cgi?id=394492