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TIL: GTK/cairo applications - like #Firefox - don't like font antialiasing together with embedded bitmaps like in #emoji fonts. If e.g. unicode.org/emoji/charts/full-emoji-list.html doesn't display anything in the "Browser" column for you in #Firefox, then disabling antialiasing and/or allowing (1/2)
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embedded bitmaps for the "Noto Color Emoji" font should fix it. More details available at bugzilla.mozilla.org/show_bug.cgi?id=1454152 (2/2)