2068166 - Newtab searchbar results view doesn't open on mousedown when the searchbar is empty

Status: VERIFIED FIXED

(Firefox :: Address Bar, defect, P1)

Description

[Moritz Beier [:mbeier]]

STR:

1. Enable browser.urlbar.newtab.featureGate (enabled by default in nightly)
2. Open the newtab page and click the search bar (while the search bar is empty)

Expected:
Results view opens and shows recent searches and/or trending results

Actual:
Results view doesn't open.
Note: it opens when pressing arrow down.

Comment 1

[Dão Gottwald [:dao]]

Attachment: Bug 2068166 - Stop reading the chrome-only composedTarget when handling mousedown. r?mbeier!

composedTarget is chrome-only, so it reads as undefined in the page's realm and the handler broke out before opening the view. The two reads differ only for a mousedown inside a descendant's shadow tree -- a moz-button -- which is neither of the nodes compared against, since composedTarget resolves the input's own anonymous content to the input itself.

This was leftover from the abandoned attempt to use shadow DOM in bug 1986130.

Comment 2

[Pulsebot]

Pushed by [e-mail]:
https://github.com/mozilla-firefox/firefox/commit/5d8939058bae
https://hg.mozilla.org/integration/autoland/rev/c317c83e1401
Stop reading the chrome-only composedTarget when handling mousedown. r=mbeier

Comment 3

[Sandor Molnar[:smolnar]]

https://hg.mozilla.org/mozilla-central/rev/c317c83e1401

Comment 4

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

Reproducible on a 2026-09-01 Firefox Nightly build on Windows 10.

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