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Showing content from https://bugzilla.mozilla.org/1921951 below:

Vertical tabs list does not scroll to show new background tabs

Vertical tabs list does not scroll to show new background tabs

Bug Flags:

This bug is publicly visible.

STR:

1. Start with sidebar.verticalTabs = true and sidebar.revamp = true.
2. Create many tabs (Ctrl+T) so the tab list overflows.
3. Select the first tab and scroll to the bottom of the list.
4. Middle-click a link or right-click > "Open Link in New Tab".

Expected:
Tab list scrolls to the start to show the new tab like with horizontal tabs.

Actual:
Scroll position does not change and the new tabs are not shown.

It works when creating new tabs in the foreground (eg Shift + middle-click) but not in the background.

Severity: -- → S3

Priority: -- → P2

Assignee: nobody → sclements

Status: NEW → ASSIGNED

Priority: P3 → P2

Hi! Im the dev of zen browser and I would like to know if I can tackle down this issue? I've already found a solution fot it, id like to start contributing to firefox! Please let me know if I can submit a PR. Thanks!

- Attachment description: WIP: Bug 1921951 - Added support for vertical tabbar scrolling → Bug 1921951 - Added support for vertical tabbar scrolling

(In reply to Mauro B from comment #4)

Hi! Im the dev of zen browser and I would like to know if I can tackle down this issue? I've already found a solution fot it, id like to start contributing to firefox! Please let me know if I can submit a PR. Thanks!

Welcome Mauro, and thank you for contributing! Great work on Zen Browser!

Assignee: sclements → mau.b

Flags: needinfo?(sclements)

Sorry about that! Still learning. Should be ready now 👍

Status: ASSIGNED → RESOLVED

Closed: 4 months ago

Resolution: --- → INVALID

Status: RESOLVED → REOPENED

Resolution: INVALID → ---

Status: REOPENED → RESOLVED

Closed: 4 months ago → 4 months ago

Resolution: --- → INVALID

Status: RESOLVED → REOPENED

Flags: needinfo?(sclements)

Resolution: INVALID → ---

- Attachment description: WIP: Bug 1921951 - Added support for vertical tabbar scrolling (Fixed linter errors) → Bug 1921951 - Fixed linter errors.

Since nightly and release are affected, beta will likely be affected too.
For more information, please visit BugBot documentation.

Mauro, for future reference if this bug was already assigned to someone you should not essentially take over the bug by pushing a patch to it - that's not cool.

Oh, sorry... I didn't know. Im new in this, I already had a fix so I thought of asking if y'all would like it

(In reply to Mauro B from comment #15)

Oh, sorry... I didn't know. Im new in this, I already had a fix so I thought of asking if y'all would like it

Contributions are most welcome but please take a look at our guidelines. If someone is assigned a bug already, it means they are working on their own solution.

Managed to reproduce the issue on Firefox 133.0a1 (2024-10-06) (64-bit), under Windows 11x64.
The issue is no longer reproducible on Firefox 137.0a1 (2025-02-07), or on Firefox 136.0b2.
Tests were performed under Windows 11 x64 ,macOS 10.15 and Ubuntu 22.04.

Status: RESOLVED → VERIFIED

Flags: qe-verify+

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