1972060 - Too many vertical tabs causes tools in sidebar to get pushed off screen

Status: VERIFIED FIXED

(Firefox :: Sidebar, defect, P1)

Description

[Mike Conley (:mconley) (:⚙️)]

Attachment: vertical-tab-tools-overflow.mp4

STR:

1. Be on a version of Nightly that has the patches from bug 1954155 applied
2. Make sure vertical tabs are enabled
3. You can enable expand on hover if you'd like. It's not strictly necessary to reproduce the issue, but in the video, I have that enabled.
4. Open many tabs

ER:
The overflow button shouldn't be pushed outside of the sidebar area.

AR:
The overflow button is pushed outside of the sidebar area and cannot be clicked. Even upon expansion, I cannot access the tools (well, I can barely access them - there's a little sliver of pixels below the newtab button that exposes the buttons).

Comment 1

[BugBot [:suhaib / :marco]]

Set release status flags based on info from the regressing bug 1954155

:kcochrane, since you are the author of the regressor, bug 1954155, could you take a look? Also, could you set the severity field?

For more information, please visit BugBot documentation.

Comment 2

[Kelly Cochrane [:kcochrane]]

Attachment: Bug 1972060 - Prevent tools/extensions area of the sidebar from overflowing below edge of window when lots of vertical tabs are opened

Comment 3

[Pulsebot]

Pushed by [e-mail]:
https://github.com/mozilla-firefox/firefox/commit/23fc30d5120b
https://hg.mozilla.org/integration/autoland/rev/b4eb74c23028
Prevent tools/extensions area of the sidebar from overflowing below edge of window when lots of vertical tabs are opened r=sidebar-reviewers,nsharpley

Comment 4

[Cristian Tuns]

https://hg.mozilla.org/mozilla-central/rev/b4eb74c23028

Comment 5

[BugBot [:suhaib / :marco]]

Set release status flags based on info from the regressing bug 1954155

Comment 6

[Monica Chiorean]

I was able toe reproduce the issue on Win11x64 using FF build 141.0a1(20250613211349).
Verified as fixed on Win11x64 using FF builds 142.0a1 and 141.0b2.