2029229 - Enable back/forward navigation across Smart Window states

Status: VERIFIED FIXED

(Core :: Machine Learning: Frontend, enhancement)

Description

[Justin Levinsohn]

When navigating between Smart Window states (e.g. new tab, standalone chat, web pages), back/forward navigation is not consistently available. Users should be able to navigate backward and forward across these states.

• Back/forward navigation is available when user has navigated between Smart Window states

• Navigating forward past a new tab or standalone chat, then going back, allows returning to the previous state

• Navigation history includes:

  • new tab (Smart Window empty state)
  • standalone chat
  • web pages visited within Smart Window

• Back and forward controls update correctly based on navigation state

• Navigating back restores the correct UI state (content, scroll position if applicable)

• Behavior is consistent across full-width and sidebar modes

Figma link

Comment 1

[echa]

Attachment: Bug 2029229 - Enable back/forward navigation across Smart Window states r=#ai-frontend-reviewers

Comment 2

[Pulsebot]

Pushed by [e-mail]:
https://github.com/mozilla-firefox/firefox/commit/776304ba7e14
https://hg.mozilla.org/integration/autoland/rev/2d06dd8391ee
Enable back/forward navigation across Smart Window states r=ai-frontend-reviewers,desktop-theme-reviewers,gcardieri,tgiles

Comment 3

[Pulsebot]

Pushed by [e-mail]:
https://github.com/mozilla-firefox/firefox/commit/f865d0a420d4
https://hg.mozilla.org/integration/autoland/rev/239777a2e444
Revert "Bug 2029229 - Enable back/forward navigation across Smart Window states r=ai-frontend-reviewers,desktop-theme-reviewers,gcardieri,tgiles" for causing bc and TV failures at /aiwindow/ui/test/browser/browser

Comment 4

[Silaghi Andreea]

Backed out for causing bc and TV failures at aiwindow/ui/test/browser
Backout Link
Push with failures
Failure Log
Failure line TEST-UNEXPECTED-FAIL | leakcheck large nsGlobalWindowInner | browser/components/aiwindow/ui/test/browser/browser.toml

Comment 5

[Pulsebot]

Pushed by [e-mail]:
https://github.com/mozilla-firefox/firefox/commit/1817b65d0b17
https://hg.mozilla.org/integration/autoland/rev/86acc06cb45b
Enable back/forward navigation across Smart Window states r=ai-frontend-reviewers,desktop-theme-reviewers,gcardieri,tgiles

Comment 6

[Phabricator Automation]

firefox-beta Uplift Approval Request

• User impact if declined/Reason for urgency: Currently in Smart Window user is not able to navigate back to full page chat mode or forwards out of full page chat mode
• Code covered by automated testing?: yes
• Fix verified in Nightly?: yes
• Needs manual QE testing?: yes
• Steps to reproduce for manual QE testing: - Open Smart Window and start full page chat
• Once messages are sent in full page mode, navigate to another URL
• Navigate "back"
• Expected result: "Back" and "forward" nav buttons should be available
• Risk associated with taking this patch: low
• Explanation of risk level: Low: adding boolean check to see if user can navigate based on history
• String changes made/needed?: No
• Is Android affected?: unknown

Comment 7

[echa]

Attachment: Bug 2029229 - Enable back/forward navigation across Smart Window states

Original Revision: https://phabricator.services.mozilla.com/D292872

Comment 8

[Phabricator Automation]

firefox-release Uplift Approval Request

• User impact if declined/Reason for urgency: Currently in Smart Window user is not able to navigate back to full page chat mode or forwards out of full page chat mode
• Code covered by automated testing?: yes
• Fix verified in Nightly?: yes
• Needs manual QE testing?: yes
• Steps to reproduce for manual QE testing: - Open Smart Window and start full page chat
• Once messages are sent in full page mode, navigate to another URL
• Navigate "back"
• Expected result: "Back" and "forward" nav buttons should be available
• Risk associated with taking this patch: low
• Explanation of risk level: Low: adding boolean check to see if user can navigate based on history
• String changes made/needed?: No
• Is Android affected?: unknown

Comment 9

[echa]

Attachment: Bug 2029229 - Enable back/forward navigation across Smart Window states

Original Revision: https://phabricator.services.mozilla.com/D292872

Comment 10

[Silaghi Andreea]

https://hg.mozilla.org/mozilla-central/rev/86acc06cb45b

Comment 11

[Pulsebot]

https://github.com/mozilla-firefox/firefox/commit/a6a06099167a
https://hg.mozilla.org/releases/mozilla-beta/rev/ac678107de85

Comment 12

[Pulsebot]

https://github.com/mozilla-firefox/firefox/commit/e75c48331c09
https://hg.mozilla.org/releases/mozilla-release/rev/559491550a12

Comment 13

[Rares Doghi, Desktop QA]

Verified as fixed in our latest Release 150.0.1, our Latest Beta 151.0b4 and our latest Nightly build 152.0a1 (2026-04-27)