2047885 - The AI Assistant will not see or close all opened tabs when asked

Status: VERIFIED FIXED

(Core :: Machine Learning: Frontend, defect)

Description

[Rares Doghi, Desktop QA]

Attachment: notalltabs.mp4

Found in

• Nightly 153.0a1 (2026-06-15)

Affected versions

• Nightly 153.0a1 (2026-06-15)

Affected platforms

• all

Steps to reproduce

1. Enable Smart Window.
2. Have over 20 tabs opened.
3. Open a New Tab and Ask the assistant to close all other tabs.
4. Hover over the items from the list and Click them.

Expected result

• All other tabs should be displayed inside the Close panel, and the Ai should be able to close them all.

Actual result

• Some of the Tabs are not visible to the AI and the user cannot close them.
  Most of the tabs are displayed in the Close panel and can be closed.
  This issue occurs with All 3 AI models.

Regression range
N/A

Comment 1

[Rares Doghi, Desktop QA]

Attachment: notalltabs1.json

Attaching the exported conversation

Comment 2

[:jlewis]

Attachment: Bug 2047885 - Clean up trailing commas in AI Assistant token output

Comment 3

[Pulsebot]

Pushed by [e-mail]:
https://github.com/mozilla-firefox/firefox/commit/51181516d403
https://hg.mozilla.org/integration/autoland/rev/070e6a927159
Clean up trailing commas in AI Assistant token output r=mshillabeer

Comment 4

[Sandor Molnar[:smolnar]]

https://hg.mozilla.org/mozilla-central/rev/070e6a927159

Comment 5

[Sandor Molnar[:smolnar]]

https://hg.mozilla.org/mozilla-central/rev/070e6a927159

Comment 6

[Rares Doghi, Desktop QA]

Attachment: 2026-06-19_12h07_52.mp4

Hi, This issue seems to still occur on my end, I was asking the AI to close all my other tabs and at least 1 tab is missed, in this case the CNN tab, before it missed a google page.
I have 14 tabs opened including the new tab where I am prompting to close my other tabs, and 1 tab seems to remain opened and it never shows up in the confirmation prompt.

This happens in our latest Nightly ID 20260619040854

Comment 7

[:jlewis]

Hey Rares, thanks for flagging this. I'm looking into the cause here.

Comment 8

[:jlewis]

Thanks again for flagging this, I have filed a follow-up here: https://bugzilla.mozilla.org/show_bug.cgi?id=2049510

While my fix lessened the issue around detecting all tabs, there is a deeper issue around how the model produces URL tokens that potentially affects all tools calls and not just this one. Please let me know if you have any further questions, but the remaining fix should solve this.

Comment 9

[Rares Doghi, Desktop QA]

Verified as fixed in our latest Nightly 154.0a1 (2026-06-22) , I will verify the remaining issue when the fix for Bug 2049510 lands.

Comment 10

[BugBot [:suhaib / :marco]]

The patch landed in nightly and beta is affected.
:jlewis, is this bug important enough to require an uplift?

• If yes, please nominate the patch for beta approval.
  • See https://wiki.mozilla.org/Release_Management/Requesting_an_Uplift for documentation on how to request an uplift.
• If no, please set status-firefox153 to wontfix.

For more information, please visit BugBot documentation.

Comment 11

[Rares Doghi, Desktop QA]

Updating the main status flag.