2067043 - Newtab search bar's open results view adds to the page's scrollable overflow

Status: VERIFIED FIXED

(Firefox :: Address Bar, defect)

Description

[Dão Gottwald [:dao]]

Steps to reproduce:

1. Open about:newtab in a window short enough that the page does not scroll.
2. Type into the search bar until the results no longer fit below it.

Actual results:
A vertical scrollbar appears, shifting the search bar to the left, and the bottom of the results view is clipped.

Expected results:
The view fits inside the viewport and the page gains no scrollable overflow.

The view opens as a top-layer popover, absolutely positioned against the initial containing block, so it contributes to the page's scrollable overflow: .urlbar-background is inset 8px outside the element's border box and reaches past the viewport bottom. For the same reason max-height: 100% resolves against the scrolled canvas, so once about:newtab scrolls on its own the view is not clamped to the viewport at all.

Followup to bug 2062215.

Comment 1

[Dão Gottwald [:dao]]

Attachment: Bug 2067043 - Stop the newtab results view growing the page's scrollable area. r?daleharvey!

Comment 3

[Pulsebot]

Pushed by [e-mail]:
https://github.com/mozilla-firefox/firefox/commit/f6a8d47d980d
https://hg.mozilla.org/integration/autoland/rev/1dac0b5d86d4
Stop the newtab results view growing the page's scrollable area. r=daleharvey

Comment 4

[Sebastian Hengst [:aryx] (needinfo me if it's about an intermittent or backout)]

https://hg.mozilla.org/mozilla-central/rev/1dac0b5d86d4

Comment 5

[Ardelean Oana, Desktop Test Engineering [:oardelean]]

Reproducible on a 2026-08-27 Firefox Nightly build on Windows 10.

Verified as fixed on Firefox Nightly 157.0a1 on Windows 10, Ubuntu 22, macOS 13.