Seen on Fedora 28 with Firefox Nightly when navigating to about:welcome Observation: when loading the page the text looks fine until the animation ends and then the artifacts show up as in the screenshot.
Pretty sure this is an issue on the Graphics side. We've seen other reports with similar rendering glitches, but I don't remember the exact bug.
Component: Layout: Text → Graphics
Component: Graphics → Graphics: Text
Priority: -- → P3
Status: NEW → RESOLVED
Last Resolved: 11 months ago
Resolution: --- → DUPLICATE
Duplicate of bug: 1473041
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