Found in

• Firefox 150 beta 6

Affected versions

• Firefox Nightly 151.0a1;
• Firefox 150 beta 6.

Tested platforms

• Affected platforms: Windows 11, macOS 15;
• Unaffected platforms: Ubuntu 22.04.

Steps to reproduce

1. Open https://www.linkedin.com
2. Dismiss Sign in with Google pop-up and then "Accept cookies" from the top banner
3. Pinch zoom / smart zoom around the login buttons (Continue with Google / Sign in with email) and on the page content.

Expected result

• The elements on the page are properly displayed when pinch / smart zooming.

Actual result

• Borders are missing when zooming in, please see the attached screenshot.
• ⌘+ / ⌘- work fine for this page.

Regression range

• last good build: 2026-03-24
• first bad build: 2026-03-25
• Regressed by Bug 2023886 - Move the border preparation code from prepare.rs to border.rs. r=gw

:nical, since you are the author of the regressor, bug 2023886, could you take a look? Also, could you set the severity field?

For more information, please visit BugBot documentation.

if the regressor is bug 2023886, then 150 is not affected

(In reply to Dianna Smith [:diannaS] from comment #2)

if the regressor is bug 2023886, then 150 is not affected

That was the regressor pointed out by mozregression, but it might not make sense, as Firefox 150 beta 6 is also affected. I'm clearing the regressed by field and adding it to See also, together with bug 2026776, that is a similar issue started happening on 2026-03-25.
I'm leaving the needinfo as :nical might have an input here. Thank you!

https://hg.mozilla.org/mozilla-central/rev/cb3c0c98db74

firefox-beta Uplift Approval Request

• User impact if declined/Reason for urgency: Visual regression on linkedin when zooming
• Code covered by automated testing?: no
• Fix verified in Nightly?: yes
• Needs manual QE testing?: no
• Steps to reproduce for manual QE testing:
• Risk associated with taking this patch: low
• Explanation of risk level: Very simple patch.
• String changes made/needed?: None
• Is Android affected?: yes

Original Revision: https://phabricator.services.mozilla.com/D292877

The patch landed in nightly and beta is affected.
:nical, 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.

Verified as fixed on Firefox 151 beta 2 and latest Nightly 152.0a1 under Win 11, macOS 15 and Ubuntu 24.

Verified as fixed using Firefox 150.0.1 RC across Win 11, macOS 15 and Ubuntu 24.