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Tab on demand

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Automatic Session Restore with Tabs on Demand
Stage Landed
Status Complete
Release target Firefox 13
Health OK
Status note Tabs on Demand Landed for Fx13. Automatic session restore has not yet landed.


Product manager Asa Dotzler
Directly Responsible Individual Asa Dotzler
Lead engineer Paolo Amadini
Security lead `
Privacy lead `
Localization lead `
Accessibility lead `
QA lead Mihaela Velimiroviciu (:mihaelav)
UX lead `
Product marketing lead `
Operations lead `
Additional members `

Open issues/risks


Stage 1: Definition

1. Feature overview

Most users prefer starting the browser right where they left off. Firefox is moving to a model that restores all tabs when a user starts up the browser but delays the loading of background tabs until they are needed. This will improve the performance and usability of Firefox just after launch.


  • The ability to delay-load background tabs was originally developed as part of bug 586068, "Cascade page loads when restoring".
  • An about:config and UI boolean preference for this was implemented in bug 648683, "Expose tabs on-demand preference" (feature page).
  • This feature page is about enabling the boolean preference by default. See bug 711193 for more detail.
  • The final goal is to make it the default to restore the previous session on startup, without affecting startup performance, or responsiveness just after startup.

2. Users & use cases


3. Dependencies


4. Requirements




Stage 2: Design

5. Functional specification


6. User experience design


Stage 3: Planning

7. Implementation plan


8. Reviews

Security review


Privacy review


Localization review




Quality Assurance review


Operations review


Stage 4: Development

9. Implementation


Stage 5: Release

10. Landing criteria


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 needs-info likely need more info to determin, work with curtisk bug 749233
Privacy ` `
Localization ` `
Accessibility ` `
Quality assurance Signed off on Firefox 13.0beta1 Test Plan
User experience ` `
Product marketing ` `
Operations ` `