2017385 - Invalid selection occurs when changing select options with arrow keys

Status: VERIFIED FIXED

(Firefox :: Settings UI, defect, P2)

Description

[akulyk]

Attachment: moz-select-with-separator.mp4

Arrow key navigation selects separator as a value instead of skipping it in moz-select that has options with icons.

Steps to Reproduce:

1. Go to moz-select Storybook page.
2. Use keyboard to set focus on moz-select
3. Use the Up/Down arrow keys to navigate through the select options (dropdown is closed).
4. Observe behavior when navigation reaches the separator.

Expected Result:
Separators should be skipped during keyboard navigation, and selection should move directly to the next option.

Actual Result:
The separator is selected and treated as an undefined value.

Notes:
Does not appear to occur when using mouse selection.

Comment 1

[BugBot [:suhaib / :marco/ :calixte]]

Set release status flags based on info from the regressing bug 1969475

:mkennedy, since you are the author of the regressor, bug 1969475, could you take a look?

For more information, please visit BugBot documentation.

Comment 2

[akulyk]

Attachment: Bug 2017385 - Invalid selection occurs when changing select options with arrow keys r=#recomp-reviewers

Comment 3

[Pulsebot]

Pushed by [e-mail]:
https://github.com/mozilla-firefox/firefox/commit/d0e23b37a4e0
https://hg.mozilla.org/integration/autoland/rev/bfb0b75a7eec
Invalid selection occurs when changing select options with arrow keys r=mkennedy

Comment 4

[Serban Stanca [:SerbanS]]

https://hg.mozilla.org/mozilla-central/rev/bfb0b75a7eec

Comment 5

[BugBot [:suhaib / :marco/ :calixte]]

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

Comment 6

[BugBot [:suhaib / :marco/ :calixte]]

The patch landed in nightly and beta is affected.
:akulyk, is this bug important enough to require an uplift?

• If yes, please nominate the patch for beta approval.
  • See https://wiki.mozilla.org/Release_Management/Requesting_an_Uplift for documentation on how to request an uplift.
• If no, please set status-firefox150 to wontfix.

For more information, please visit BugBot documentation.

Comment 7

[akulyk]

There's no need to uplift this patch, as the only moz-select that has both icons and separator is used in redesigned Applications Settings section that is currently hidden behind browser.settings-redesign.enabled pref.

Comment 8

[Alexandru Trif, Desktop Test Engineering [:atrif]]

Confirming that this issue is no longer reproducible with Firefox 151.0a1 (2026-04-16) on Windows 11, macOS 26 and Ubuntu 24 using the steps from comment 0 or using keyboard arrow keys on the Applications sections with browser.settings-redesign.enabled:true.
Note that the Use other... option is not visually displayed when using arrow keys to change options. See bug 2032378