Looks like this is a subtle difference in the rendering of the downarrow on the `select` dropdown element, and it's WebRender-specific (i.e. only `*-qr` platforms are affected). The rendering difference is barely user-perceptible & doesn't really look concerning; this just needs a fuzzy annotation, looks like.
Bug 1511300 Comment 86 Edit History
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Looks like this is a subtle difference in the rendering of the downarrow on the `select` dropdown element, and it's windows-with-WebRender-specific (i.e. only `windows-*-qr` platforms are affected). The rendering difference is barely user-perceptible & doesn't really look concerning; this just needs a fuzzy annotation, looks like.