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Stub Installer and UI update
Stage Development
Status `
Release target `
Health OK
Status note `


Product manager Asa Dotzler
Directly Responsible Individual Robert Strong
Lead engineer Robert Strong
Security lead `
Privacy lead `
Localization lead `
Accessibility lead `
QA lead Jason Smith
UX lead `
Product marketing lead `
Operations lead `
Additional members `

Open issues/risks


Stage 1: Definition

1. Feature overview

Building a stub installer offers numerous advantages over our current installation process. It is necessary for us to understand our acquisition funnel and potentially get some early wins on improving download failures.

In addition, to support Windows x64 we would like to have a stub installer that checks if the user is running Windows x64 and then downloads / installs the correct bits. To accomplish this, I propose we use the existing installer, have it check if it already has the files to install, and if it doesn't have it download an archive containing the correct files. To support this, a rewrite of the installer user interface will be necessary.

2. Users & use cases

Enable product (stub installer) downloads over SSL

3. Dependencies


4. Requirements

See UX specs here:



Stage 2: Design

5. Functional specification


6. User experience design

Initial mockups can be found in bug 651965.

Most recent mockup:

Note that after the user clicks install on step 1, even if they walk away Firefox will eventually be installed. This will likely improve conversion, since the stub installer is considerably smaller than the entire Firefox download (and they may lose interest at the download stage).

Here's a high level view of our previous install process

Stage 3: Planning

7. Implementation plan


8. Reviews

Security review

A security review should not be necessary for the installer user interface rewrite though a security review will most assuredly be required for the stub installer (bug 322206).

Privacy review


Localization review




Quality Assurance review


Operations review


Stage 4: Development

9. Implementation

These are the bugs we are using the track this work...

  • bug 651965 - Installer user interface rewrite
  • bug 322206 - Firefox net / stub installer (depends on bug 651965)
  • bug 628869 - [Win] update installer elements to read Mozilla Firefox (depends on bug 651965)

    Stage 5: Release

    10. Landing criteria


    Feature details

    Priority P2
    Rank 15
    Theme / Goal Product Hardening
    Roadmap Firefox Desktop
    Secondary roadmap Security
    Feature list Desktop
    Project `
    Engineering team Platform Integration

    Team status notes

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