2010728 - "New AI Window" and "New Classic Window" items shown in macOS File menu when no Firefox windows are open

Status: VERIFIED FIXED

(Firefox :: Menus, defect, P1)

Description

[Scott Macpherson]

Attachment: File menu when no Firefox windows are open

When Firefox is running but doesn't have any open windows (in macOS), a couple of options appear in the "File" menu which I assume should not be shown to users running the Release version?

• "New AI Window"
• "New Classic Window"

Firefox 147.0, macOS 26.2.

Comment 1

[Scott Macpherson]

Attachment: File menu when Firefox *does* have some windows

Comment 2

[BugBot [:suhaib / :marco/ :calixte]]

:jlewis, since you are the author of the regressor, bug 2000985, could you take a look? Also, could you set the severity field?

For more information, please visit BugBot documentation.

Comment 3

[:jlewis]

Attachment: Bug 2010728 - 'New AI Window' and 'New Classic Window' items shown in macOS File menu when no Firefox windows are open

Comment 4

[Pulsebot]

Pushed by [e-mail]:
https://github.com/mozilla-firefox/firefox/commit/a677d0b93275
https://hg.mozilla.org/integration/autoland/rev/5eab6997731f
'New AI Window' and 'New Classic Window' items shown in macOS File menu when no Firefox windows are open r=ai-frontend-reviewers,echa

Comment 5

[Phabricator Automation]

firefox-beta Uplift Approval Request

• User impact if declined: Incorrect menu items shown in macOS 'File' menu (ie Smart Window-specific buttons even if AI prefs disabled) with incorrect functionality as well.
• Code covered by automated testing: yes
• Fix verified in Nightly: yes
• Needs manual QE test: yes
• Steps to reproduce for manual QE testing: (Using macOS)

1. Open Firefox with 'browser.aiwindow.enabled' pref FALSE
2. Close all windows
3. Open Firefox 'File' menu and see incorrect menu items (New Classic Window, New AI Window)

• Risk associated with taking this patch: low
• Explanation of risk level: Fairly low risk as fix addresses silent failure - primary addition is a null check with only few lines changed in total.
• String changes made/needed: No
• Is Android affected?: no

Comment 6

[:jlewis]

Attachment: Bug 2010728 - 'New AI Window' and 'New Classic Window' items shown in macOS File menu when no Firefox windows are open

When no windows open:

• Smart Window //File menu// items should not appear if **!**browser.smartwindow.enabled

Original Revision: https://phabricator.services.mozilla.com/D284723

Comment 7

[rperta]

https://hg.mozilla.org/mozilla-central/rev/5eab6997731f

Comment 8

[Ed Lee :Mardak]

dmeehan, this bug appears even when aiwindow pref is not enabled

Comment 9

[Donal Meehan [:dmeehan]]

Thanks :Mardak for the correction.
:jlewis, could you also add a release uplift request? We could include it in the planned dot release for Fx148.

Comment 10

[:jlewis]

Attachment: Bug 2010728 - 'New AI Window' and 'New Classic Window' items shown in macOS File menu when no Firefox windows are open

When no windows open:

• Smart Window //File menu// items should not appear if **!**browser.smartwindow.enabled

Original Revision: https://phabricator.services.mozilla.com/D284723

Comment 11

[Phabricator Automation]

firefox-release Uplift Approval Request

• User impact if declined: Incorrect menu items shown in macOS 'File' menu (ie Smart Window-specific buttons even if AI prefs disabled) with incorrect functionality as well. Confusing UX + want to keep AI features out of non-AI context.
• Code covered by automated testing: yes
• Fix verified in Nightly: yes
• Needs manual QE test: yes
• Steps to reproduce for manual QE testing: 1. Open Firefox with 'browser.aiwindow.enabled' pref FALSE

2. Close all windows

3. Open Firefox 'File' menu and see incorrect menu items (New Classic Window, New AI Window)

• Risk associated with taking this patch: low
• Explanation of risk level: Fairly low risk as fix addresses silent failure - primary addition is a null check with only few lines changed in total.
• String changes made/needed: No
• Is Android affected?: no

Comment 12

[Phabricator Automation]

firefox-release Uplift Approval Request

• User impact if declined: Incorrect menu items shown in macOS 'File' menu (ie Smart Window-specific buttons even if AI prefs disabled) with incorrect functionality as well. Confusing UX + want to keep AI features out of non-AI context.
• Code covered by automated testing: yes
• Fix verified in Nightly: no
• Needs manual QE test: yes
• Steps to reproduce for manual QE testing: 1. Open Firefox with 'browser.aiwindow.enabled' pref FALSE

2. Close all windows

3. Open Firefox 'File' menu and see incorrect menu items (New Classic Window, New AI Window)

• Risk associated with taking this patch: low
• Explanation of risk level: Fairly low risk as fix addresses silent failure - primary addition is a null check with only few lines changed in total.

Larger fix verified in Nightly - cherry-picked fix for release uses simplified version (condition check for function + test).

• String changes made/needed: No
• Is Android affected?: no

Comment 13

[Pulsebot]

https://github.com/mozilla-firefox/firefox/commit/6f720071cbfc
https://hg.mozilla.org/releases/mozilla-beta/rev/c9441024d1c9

Comment 14

[Ciprian Georgiu, Desktop QA]

I reproduced this issue using an affected Nightly 149.0a1 (2026-01-15) under macOS 26.

The issue is verified as fixed on latest Beta 149.0b2 and Nightly 150.0a1 under macOS 26.

Comment 15

[Pulsebot]

https://github.com/mozilla-firefox/firefox/commit/7365bb22f402
https://hg.mozilla.org/releases/mozilla-release/rev/99eba95740cf

Comment 17

[Ciprian Georgiu, Desktop QA]

This is also verified as fixed on macOS 26 and Win 11 with Firefox 148.0.2 (20260309125808).

Comment 18

[Ciprian Georgiu, Desktop QA]

This is also verified as fixed on macOS 26 and Win 11 with Firefox 148.0.2 (20260309125808).