Solved it. The "Noto Sans" font family contains four typefaces including Italic. I've been using it for the longest time (over four years), and it was selecting the Regular weight non-italic typeface as the default. In recent months it has for some reason started selecting the Italic face instead for display. I changed both the font family and the userstyle.css to use "Liberation Sans", and we're back to golden. I wonder what has changed to trigger a different selection?
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