I'm seeing the same thing in Firefox 57.0.3 on Debian, if my viewport is more than or equal to 1320 pixels wide. It goes away for the text on screen if I force

I'm seeing the same thing in Firefox 57.0.3 on Debian, if my viewport is more than or equal to 1320 pixels wide. It goes away for the text on screen if I force it to repaint, but comes back if I scroll or resize the viewport.