2068104 - New Tab search bar paints over the New Tab settings pane

Status: VERIFIED FIXED

(Firefox :: Address Bar, defect, P1)

Description

[Dão Gottwald [:dao]]

The search bar on about:newtab enters the top layer with showPopover() when it connects, and stays there for the element's lifetime. New Tab's settings pane is a <dialog> opened with showModal(), so it is in the top layer too. The top layer paints in the order elements enter it and z-index cannot reorder that, so whichever entered last wins.

Steps to reproduce:

1. Open about:newtab and open the settings pane.
2. Turn off widgets and recommended stories.

The layout change remounts the search bar, whose popover then enters the top layer after the pane's dialog, and the bar paints over the pane. The bar needs the top layer only while its results view is open.

Comment 1

[Dão Gottwald [:dao]]

Attachment: Bug 2068104 - Enter the top layer only while an in-page address bar is open. r?mbeier!

A closed element keeps the box it had: it stays broken out, and only gives up the top layer.

Comment 2

[Pulsebot]

Pushed by [e-mail]:
https://github.com/mozilla-firefox/firefox/commit/0b69bf96e413
https://hg.mozilla.org/integration/autoland/rev/68ebda97afbb
Enter the top layer only while an in-page address bar is open. r=mbeier,urlbar-reviewers

Comment 3

[Sandor Molnar[:smolnar]]

https://hg.mozilla.org/mozilla-central/rev/68ebda97afbb

Comment 5

[Petruta Horea [:phorea]]

Reproduced the initial issue using Nightly 157.0a1 2026-08-28.
Verified as fixed on Firefox 157 beta 2 and latest Nightly 158.0a1, under Win 11 and macOS 15.