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Feature name here
Stage Draft
Status `
Release target `
Health `
Status note `


Product manager `
Directly Responsible Individual `
Lead engineer `
Security lead `
Privacy lead `
Localization lead `
Accessibility lead `
QA lead `
UX lead `
Product marketing lead `
Operations lead `
Additional members `

Open issues/risks


Stage 1: Definition

1. Feature overview

Add a "Reading Mode" to Firefox that presents textual content in a beautiful, readable format, and tracks your reading across your desktop and mobile devices.

2. Users & use cases

  • Reading long textual articles.
  • Reading offline (e.g. airplane, subway).
  • Saving pages to read later.
  • Starting an article on one device and finishing on another.

3. Dependencies


4. Requirements

Read anywhere

  • Your reading list is synced across your devices.
  • Your furthest-read position in each article is synced across devices.
  • Articles from your reading list are saved for reading offline.
    • We could limit to reduce bandwidth and disk issues without impacting the main use case. For example, we could save the 20 most recent articles for offline reading by default, and this could be configurable.


  • Reading mode is full screen with no distractions.
  • Pagination instead of scrolling, with a quick tap to change pages. (Reduces swiping fatigue in long articles.)
  • Beautiful typography, with typefaces and layouts optimized separately for phone, tablet, and desktop displays.
    • We could ship our own high-quality fonts (in WOFF format?).
  • Pinch zoom adjusts font size while keeping text formatted to fit the screen.


  • Built-in feature, not an add-on. (This is necessary for the "read anywhere" magic to work without going through set-up steps on multiple devices.)
  • Zero set-up. Reader works on one device without a sync account, and any time you pair two devices your reading list will sync automatically.
  • Discoverable through the core interface.
  • Fast and responsive.
  • Smooth animated transitions in and out of reading mode.
  • Double-tap to enter full-screen mode.
    • On Maemo this was a zooming gesture, but Android has pinch as the core zooming gesture.
    • Other Android apps like YouTube use double-tap to enter full screen mode.
    • Double-tap on forms or navigation elements should zoom them to a touchable size; double-tap on image, video, or text content should activate special full-screen image, video, or "reader" modes.


These items are desirable, but not required for the initial release:

  • Highly customizable display settings (brightness, color, choice of fonts).
  • Integration with third-party services and apps (Instapaper, Read It Later).
  • Custom UX for tags, folders, favorites, integrated sharing. (The initial release can provide the same bookmarking/sharing options that we offer for all web pages.)
  • Web app for reading in other browsers.

Stage 2: Design

5. Functional specification

A brief sketch of a possible UX flow:


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 Unprioritized
Rank 999
Theme / Goal `
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Team status notes

  status notes
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User experience ` `
Product marketing ` `
Operations ` `