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gray line on top of window after recent update

TyDraniu replied
b.registracijos

Hello, after ff updated, gray line appeared. It does not disappear after changing theme. I am using laptop and a monitor. On laptop browser window goes fully to the top, but when i drag ff to the secondary monitor, gray line appears. I will attach photos.

Hello, after ff updated, gray line appeared. It does not disappear after changing theme. I am using laptop and a monitor. On laptop browser window goes fully to the top, but when i drag ff to the secondary monitor, gray line appears. I will attach photos.
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選擇的解決方法

It's being investigated. For now you can try to go to about:config and switch widget.windows.windowsappsdk.enabled to false, then restart.