1960604 - [Windows] The "X" button of the custom wallpaper message is hardly visible while High Contrast mode is enabled

Status: NEW

(Firefox :: New Tab Page, defect)

Description

[Cosmin Muntean [:cmuntean], Ecosystem QA]

Attachment: message with high contrast mode.mp4

[Affected versions]:

• Firefox Beta 138.0b7 (Build ID: 20250414092054)
• Nightly 139.0a1 (Build ID: 20250409210623)

[Affected Platforms]:

• Windows 10 x64
• Windows 11 x64

[Prerequisites]:

• Have a Firefox Beta 138.0b2 en-US build installed/extracted.
• Have the following prefs set:
• browser.search.region = US
• nimbus.debug = true

[Steps to reproduce]:

1. Open the browser with the profile from prerequisites.
2. Navigate to the following link to force enroll in the experiment: about:studies?optin_slug=test-custom-wallpaper&optin_branch=control&optin_collection=nimbus-preview
3. Open a new tab to trigger the message.
4. Observe the "X" button from the custom wallpaper message.

[Expected result]:

• The "X" button is visible.

[Actual result]:

• The "X" button is hardly visible.

[Notes]:

• Attached is a screen recording of the issue.