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Flathub recently added support for "brand colors"[0] that app stores can use to improve an app's presentation. Sam Hewitt was kind enough to provide some for the Extensions app, add them to the metainfo. [0] https://docs.flathub.org/blog/introducing-app-brand-colors/ Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/3226>