Features/Desktop/Firefox reset option on reinstall

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Stage Feature Inbox
Status In progress
Release target `
Health OK
Status note Firefox approach ready to proceed. NSIS approach dependent on the stub installer and would require new mockups for it.


Product manager Asa Dotzler
Directly Responsible Individual Michael Verdi
Lead engineer Robert Strong
Security lead `
Privacy lead `
Localization lead `
Accessibility lead `
QA lead `
UX lead Madhava Enros
Product marketing lead `
Operations lead `
Additional members Matthew Noorenberghe

Open issues/risks

Decide on one of the two approaches in stage 3.

Stage 1: Definition

1. Feature overview

The Firefox Reset is effective in fixing many issues involving the profile folder including removing unwanted add-ons and resetting the preferences that they have changed. Currently this feature is hidden in about:support and making it discoverable without a trip to the support site could help millions of Firefox users recover from issues that make Firefox unusable.

A bug has been filed for this work: https://bugzilla.mozilla.org/show_bug.cgi?id=750979

More info here: https://wiki.mozilla.org/Support/Firefox_Features/Clean_up_user_profile

2. Users & use cases

A user determines that "something" is wrong with Firefox, so they attempt to fix it by reinstalling. When Firefox (or the installer) detects that the same version of Firefox already exists on the computer it will offer the option to repair Firefox by resetting it to its default state.

3. Dependencies


4. Requirements




Stage 2: Design

5. Functional specification


6. User experience design


Stage 3: Planning

7. Implementation plan

There are two major approaches:

  1. Firefox itself detects the re-install. (Cross-platform and written in JS)
    • Firefox can remember file modification times and the last version used to detect a re-install.
  2. The Windows installer detects the re-install. (Windows-only using NSIS)

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 Unprioritized
Rank 999
Theme / Goal `
Roadmap `
Secondary roadmap `
Feature list `
Project `
Engineering team `

Team status notes

  status notes
Products ` `
Engineering ` `
Security ` `
Privacy ` `
Localization ` `
Accessibility ` `
Quality assurance ` `
User experience ` `
Product marketing ` `
Operations ` `