2015465 - Move tab to Split View will focus the other window if the tab came from a different window

Status: VERIFIED FIXED

(Firefox :: Tabbed Browser: Split View, defect)

Description

[Alexandru Trif, Desktop Test Engineering [:atrif]]

Attachment: move_tab_1.gif

Found in

• 149.0a1 (2026-02-08)

Affected versions

• 149.0a1 (2025-02-08)

Tested platforms

• Affected platforms: Windows 11, macOS 26, Ubuntu 24

• Unaffected platforms:

Steps to reproduce

1. In window 1, create a Split View.
2. Open window 2 and open two tabs.
3. Inside the Split View, use the Move tab to Split View option to move a tab from window 2 to window 1.

Expected result

• The focus remains on window 1.

Actual result

• The focus is changed to window 2.

Regression range

• Not a regression.

Additional notes

• Attached a screen recording.

Comment 1

[Sarah Clements [:sclements]]

I'm not following the issue. Is this something specific to tabs in a splitview or general tab or group behavior?

Comment 2

[Alexandru Trif, Desktop Test Engineering [:atrif]]

(In reply to Sarah Clements [:sclements] from comment #1)

I'm not following the issue. Is this something specific to tabs in a splitview or general tab or group behavior?

It seems that this is no longer reproducible with 149.0a1 (2026-02-13) on Windows 11, macOS 26 and Ubuntu 24. Most likely bug 2013464 fixed this, since I can reproduce the issue with a build before that patch.