Recent fresh install of 2.4.6-p3 adds border to backend grids

[magentox]

Preconditions and environment

• Magento version: 2.4.6-p3
• Make a fresh install of Magento-2.4.6-p3 and compare to one you may already have installed back in Oct. 2023 when it was released.

Steps to reproduce

Navigate to any backend grids, order, pages, blocks...all grids have that border.

Expected result

There should be no border in backend grids but it seems that a recent update of one of Magento vendor folder is causing this

Actual result

I have 1 store with Magento 2.4.6-p3 without border on backend border, that store did not get any update of it's vendor's folder. I decided to update them (a lot of them) and noticed a border on admin grid that wasn't there previously. So I decided to try a fresh install of Magento 2.4.6-p3. Same problem. The border is also there.

It also happens when updating an existing store on Magento 2.4.6-p2 to Magento 2.4.6-p3. I suspect an update of one component in the vendor folder is causing this.

Update: It's NOT a component of vendor folder. I just found that the border is not visible on Chrome 121 but only visible on Firefox 122. So the problem is only for Firefox users.

Additional information

Magento 2.4.6-p3 without any update to vendor folder since release in Oct. 2023:

Magento 2.4.6-p3 freshly installed (January 2024):

Release note

No response

Triage and priority

• Severity: S0 - Affects critical data or functionality and leaves users without workaround.
• Severity: S1 - Affects critical data or functionality and forces users to employ a workaround.
• Severity: S2 - Affects non-critical data or functionality and forces users to employ a workaround.
• Severity: S3 - Affects non-critical data or functionality and does not force users to employ a workaround.
• Severity: S4 - Affects aesthetics, professional look and feel, “quality” or “usability”.

[m2-assistant]

Hi @magentox. Thank you for your report.
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[m2-assistant]

Hi @engcom-Dash. Thank you for working on this issue.
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[engcom-Dash]

Hi @magentox

Thanks for reporting and collaboration.

Verified the issue in both magento 2.4.6-p3 and 2.4 dev instance in firefox

Can you please let us know what exactly is the expected? We have attached the screenshots for both 2.4.6-p3 and 2.4 dev instance.Please refer the screenshots.

[kestraly]

It looks like @magentox is referring to the header row having a double border?

[engcom-Dash]

Hi @magentox ,
Can you please confirm if you are referring to the header row having a double border?

[magentox]

@kestraly @engcom-Dash
Sorry for late reply, yes I am referring to the header row having a double border and it seems to be specific to Firefox.

I will try to revert to Firefox 121 to verify it it appeared after the recent update to Firefox 122.

[engcom-Dash]

Hi @magentox

Thanks for your reply.

I have verified the issue on magneto 2.4 dev instance in both 121 and 122 firefox versions.
Please refer the attached screenshots.

In firefox 121:

In firefox 122:

The issue is reproducible after upgrading from firefox 121 to 122.
So we are confirming this issue.