I am using Firefox Nightly 155.0a1 on Windows 10 22H2 running inside a virtual machine (entity machine not yet tested).
Issue: There is an abnormal protruding/outlined block on the outer window frame (outside the content area, part of the browser chrome/window decoration) of Firefox. It looks like a misrendered segment of the window border — a small raised/blob-like area sticking out from the frame edge, not related to any web page content.
