People wonder why Rubén Rodríguez discontinued Windows and macOS
releases for IceCat after version 38.8.0. I asked him to clarify this on
https://www.gnu.org/software/gnuzilla/ which he updated immediately:
"Note that building binary packages for Windows and macOS currently
requires non-free software, so we no longer distribute binary releases
for those platforms."
Unofficial download links for macOS and Windows are listed in
https://directory.fsf.org/wiki/IceCat#tab=Details
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http://gnuzilla.gnu.org