2034643 - Add inline model picker to Smartbar

Status: VERIFIED FIXED

(Core :: Machine Learning: Frontend, task)

Description

[Justin Levinsohn]

Attachment: select model - new tab.png

Display the current model in the Smartbar and allow users to open a picker to select a model.

• Current model is shown in the Smartbar (descriptor + model name + icon)
• Clicking the current model opens the picker menu
• Picker displays available models:
  • Fast
  • Flexible
  • Personal
  • Custom model (if configured)
• Each model displays:
  • icon
  • descriptor
  • model name/provider
• Current model is visually indicated in the picker
• Selecting a model updates the selected state in the picker UI
• Picker supports:
  • hover states
  • focus states
  • keyboard navigation
• Picker includes link/entry point to model settings
• Display and picker render correctly in:
  • new tab state
  • active Smart Window conversations
• No persistence or behavioral changes required in this ticket (UI only)

Figma Specs

• Light Mode

Comment 1

[Justin Levinsohn]

Attachment: default.png

Comment 2

[Justin Levinsohn]

Attachment: select model.png

Comment 3

[Florian Zia [:flozia]]

Attachment: Bug 2034643 - Part 1: Add model select to smartbar

Adds a model selector dropdown to the smartbar that allows users to:

• Select from available models per tab
• Access Smart Window model settings

Comment 4

[Florian Zia [:flozia]]

Attachment: Bug 2034643 - Part 2: Update system prompt to reflect model switch

Adds support for switching models per tab:

• Extends openAIEngine.build() to accept a modelChoiceId override
• Adds ChatConversation.updateSystemPromptForModel() to update the system prompt when model changes

Comment 5

[Florian Zia [:flozia]]

Attachment: Bug 2034643 - Part 3: Add test for smartbar model switch

Comment 6

[Florian Zia [:flozia]]

Attachment: Bug 2034643 - Part 4: Handle default model setting change in open tabs

Comment 7

[Pulsebot]

Pushed by [e-mail]:
https://github.com/mozilla-firefox/firefox/commit/de1e69fe9d21
https://hg.mozilla.org/integration/autoland/rev/a6c1e8693d67
Part 1: Add model select to smartbar r=desktop-theme-reviewers,urlbar-reviewers,fluent-reviewers,echa,mak,flod,emilio
https://github.com/mozilla-firefox/firefox/commit/4f2443b44140
https://hg.mozilla.org/integration/autoland/rev/e76955accaf9
Part 2: Update system prompt to reflect model switch r=echa,cgopal
https://github.com/mozilla-firefox/firefox/commit/dfaa3e575f92
https://hg.mozilla.org/integration/autoland/rev/194f9ae31b09
Part 3: Add test for smartbar model switch r=echa,cgopal
https://github.com/mozilla-firefox/firefox/commit/94cd79246946
https://hg.mozilla.org/integration/autoland/rev/7092db953ff7
Part 4: Handle default model setting change in open tabs r=echa

Comment 8

[Pulsebot]

Pushed by [e-mail]:
https://github.com/mozilla-firefox/firefox/commit/f8ee411b2f86
https://hg.mozilla.org/integration/autoland/rev/91a45c0a367d
Revert "Bug 2034643 - Part 4: Handle default model setting change in open tabs r=echa" for causing bc failures @ browser_all_files_referenced

Comment 9

[amarc]

Backed out for causing bc failures

• Backout link
• Push with failures
• Failure Log

Comment 10

[Pulsebot]

Pushed by [e-mail]:
https://github.com/mozilla-firefox/firefox/commit/4c24a6346d6b
https://hg.mozilla.org/integration/autoland/rev/8f82d2854368
Part 1: Add model select to smartbar r=desktop-theme-reviewers,urlbar-reviewers,fluent-reviewers,echa,mak,flod,emilio
https://github.com/mozilla-firefox/firefox/commit/78087ea35dff
https://hg.mozilla.org/integration/autoland/rev/042ac8863544
Part 2: Update system prompt to reflect model switch r=echa,cgopal
https://github.com/mozilla-firefox/firefox/commit/1a7057a5f124
https://hg.mozilla.org/integration/autoland/rev/5b34d11a25b0
Part 3: Add test for smartbar model switch r=echa,cgopal
https://github.com/mozilla-firefox/firefox/commit/7878c3ff7b83
https://hg.mozilla.org/integration/autoland/rev/5b4b471cdb03
Part 4: Handle default model setting change in open tabs r=echa

Comment 11

[Cristian Tuns]

https://hg.mozilla.org/mozilla-central/rev/8f82d2854368
https://hg.mozilla.org/mozilla-central/rev/042ac8863544
https://hg.mozilla.org/mozilla-central/rev/5b34d11a25b0
https://hg.mozilla.org/mozilla-central/rev/5b4b471cdb03

Comment 12

[Rares Doghi, Desktop QA]

This issue is verified as fixed in our latest Nightly 153.0a1 (2026-06-11)

Comment 14

[Rares Doghi, Desktop QA]

Updating the main status flag.

Comment 15

[Ed Lee :Mardak]

Release Note Request (optional, but appreciated)
[Why is this notable]: new smart window control
[Affects Firefox for Android]: no
[Suggested wording]: See and choose AI models directly from the Smart Window assistant. (Bug 2034643)
[Links (documentation, blog post, etc)]: https://www.firefox.com/smart-window is needed to activate the feature and it's region restricted, so we should probably show the "progressive roll out" indicator