1964855 - Vertical Tabs problem

Status: RESOLVED DUPLICATE of bug 1959446

(Firefox :: Sidebar, enhancement)

Description

[umgtm]

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:138.0) Gecko/20100101 Firefox/138.0

Steps to reproduce:

• I enabled vertical tabs with auto hide enabled.
• I have bitwarden extension installed which appears at the botton of the vertical tabs.
• I have jdownloader extension installed which also appears at the bottom of the vert. tabs.
• History, Bookmarks etc also appear at the bottom.

Actual results:

When i hover the mouse pointer over the UI, the extensions are out of place or don't match the pointer placement.

Expected results:

The extensions shouldn't be out of place when i hover the mouse over them.

Comment 1

[umgtm]

Attachment: Screen Recording 2025-05-05 at 12.07.05 pm-1.mov

Please see the attached video

Comment 2

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

The Bugbug bot thinks this bug should belong to the 'Firefox::Sidebar' component, and is moving the bug to that component. Please correct in case you think the bot is wrong.

Comment 3

[Timea Zsoldos [:tzsoldos], Desktop QA]

Thank you for the report. I was able to reproduce the issue on Windows 11 using Firefox build 140.0a1 (20250508215032).
Marking issue as new for engineering input.