For the past few days, in Firefox Nightly, I’ve been getting light purple overlays that flicker on and off as I scroll the page on basically any web site. It seems more common with portrait-aspect-ratio elements, but sometimes shows up on landscape-sized or even inline elements. Did I accidentally turn on a painting diagnostic thing, or did they? Either way, anyone know how to make it stop?

The web site for elk.zone, where the sidebar is overlaid with a light purple box.
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