1578858 - Below the main toolbar is a thin stripe in the color of the window borders when display scaling set to 125%

Status: RESOLVED DUPLICATE of bug 1543152

(Firefox :: Untriaged, defect)

Description

[u646389]

Attachment: Example

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:69.0) Gecko/20100101 Firefox/69.0

Steps to reproduce:

1. Windows 10 - up to date
2. Firefox 67 or newer (does not exist in earlier versions)
3. Firefox default theme (light or dark theme looks fine)
4. Windows display scaling set to 125% (100% looks fine, 150% looks fine too)
5. diplay resolution 1920x1080 or 1920x1200

Actual results:

Below the main toolbar is a thin stripe in the color of the window borders. The detail is in the attached picture.

The stripe is only in the window which opens after the program is launched. Every new window or private window looks fine.

If you change display scaling or windows border color while running Firefox, the stripe disappears until Firefox restart.

Expected results:

The default theme should be without the thin stripe.