Hi, It seams that neither Wikipedia nor Amazon provide their favicons in PNG format like DuckDuckGo does, so it is not possible to patch their searchengine files like I did with DDG's[1]. While it is possible to include PNG file as base64 encoded data: URL, I don't think the sites (especially Amazon) would be very glad (or maybe not) Debian distributes their copyrighted artwork.
[1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=762429#20 -- Łukasz Stelmach Samsung R&D Institute Poland Samsung Electronics
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