2058849 - [Intermittent] The autocomplete dropdowns are broken using a long entry

Status: NEW

(Toolkit :: Form Autofill, defect, P3)

Description

[Alin Ilea, Desktop Test Engineering]

Attachment: 2026-07-29_12h00_29.mp4

Found in

• Nightly 155.0a1

Affected versions

• Nightly 155.0a1

Tested platforms

• All

Preconditions

• browser.nova.enabled = true
• have at least 10 Logins/Addresses/CC saved
• have at least one very long name/username saved

Steps to reproduce

1. Go to https://luke-chang.github.io/autofill-demo/basic_cc.html?
2. Click in the name field in order to trigger the autocomplete dropdown

Expected result

• The autocomplete should be resized accordingly and displayed correctly.

Actual result

• The autocomplete dropdown is broken when at least one long entry is saved.

Notes

• The issue is reproducible with browser.nova.enabled = false as well.
• The issue seems to be intermittent reproducible, I cannot find specific steps for reproducing it, but if the user save a long entry and edit it multiple times or add multiple long entries, the issue will occur.

Comment 1

[Giorgia Nichita, Release Desktop QA]

I was able to reproduce this issue a couple of times on Ubuntu 24.04.

I also noticed that, minimizing and maximizing the Firefox window after saving a long entry appears to make the issue easier to reproduce.

Comment 2

[BugBot [:suhaib / :marco]]

The severity field is not set for this bug.
:dimi, could you have a look please?

For more information, please visit BugBot documentation.

Comment 3

[BugBot [:suhaib / :marco]]

The severity field is not set for this bug.
:dimi, could you have a look please?

For more information, please visit BugBot documentation.