Speedy Session Restore

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Status

Speedy Session Restore
Stage	Development
Status	In progress
Release target	`
Health	OK
Status note	Deprioritized. Need to regroup and retarget based on priority (tbd) and resource availability.

Team

Product manager	Asa Dotzler
Directly Responsible Individual	Lawrence Mandel
Lead engineer	Dietrich Ayala
Security lead	`
Privacy lead	`
Localization lead	`
Accessibility lead	`
QA lead	Paul Silaghi
UX lead	`
Product marketing lead	`
Operations lead	`
Additional members	`

Open issues/risks

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Stage 1: Definition

1. Feature overview

Session restore makes restarting the browser a frictionless experience.

2. Users & use cases

Starting up the browser is a common experience for all Firefox users. Many Firefox users have session restore turned on and we intend to make that the default in an upcoming release. Session restore can cause the browser to start up more slowly than without session restore. Changes that make session restore have less of an impact on startup time will allow us to enable session restore without users being bothered by slower startup times.

3. Dependencies

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4. Requirements

Restoring a session at startup must be on par or only negligibly slower than not restoring a session.
Restoring of the session is the default behavior.
Tabs are loaded on-demand by default.
Users are notified the first time a session is restored by default, and given the opportunity to disable the feature.

Non-goals

Restore a session in a more comprehensive manner than we do currently.

Stage 2: Design

5. Functional specification

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6. User experience design

The user is notified of the first default session restore by an infobar that says something like:

"Firefox has restored your previous browsing session. If you want, you can change this behavior."

And has a button labeled "Configure", which opens the preference window to the General tab.

Stage 3: Planning

7. Implementation plan

Re-architect the session restore code for better performance. bug 669034
Re-architect tabbrowser to not load <browser>s for un-restored tabs. bug 681201
Load tabs on-demand by default (DONE). bug 711193
Restore session by default. bug 735914
Implement UX specification for notifying the user about first default restore, and allowing them to configure. (same bug as above)
https://etherpad.mozilla.org/ss2
https://wiki.mozilla.org/User:Zpao/SessionStore2

8. Reviews

Security review

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Privacy review

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Localization review

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Accessibility

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Quality Assurance review

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Operations review

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Stage 4: Development

9. Implementation

Full Query

ID	Summary	Priority	Status
669034	[meta] Re-architect session restore to avoid periodic freezes	--	RESOLVED
681201	[meta] Not-yet-restored empty tabs take more memory than they should	--	RESOLVED
711193	turn on "don't load tabs until selected" by default	--	VERIFIED
735914	Restore the session by default	P3	NEW

4 Total; 1 Open (25%); 2 Resolved (50%); 1 Verified (25%);

Stage 5: Release

10. Landing criteria

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The given value "

   
     Full Query

ID	Summary	Priority	Status
669034	[meta] Re-architect session restore to avoid periodic freezes	--	RESOLVED
681201	[meta] Not-yet-restored empty tabs take more memory than they should	--	RESOLVED
711193	turn on "don't load tabs until selected" by default	--	VERIFIED
735914	Restore the session by default	P3	NEW

4 Total; 1 Open (25%); 2 Resolved (50%); 1 Verified (25%);

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Feature details

Priority	P1
Rank	999
Theme / Goal	`
Roadmap	Firefox Desktop
Secondary roadmap	`
Feature list	Desktop
Project	`
Engineering team	`

Team status notes

	status	notes
Products	`	`
Engineering	`	`
Security	sec-review-needed	bug 744934
Privacy	`	`
Localization	`	`
Accessibility	`	`
Quality assurance	`	Test Plan
User experience	`	`
Product marketing	`	`
Operations	`	`