STIX moved away from SourceForge to Github breaking download during Tor Browser build
It seems we need to update the location of
STIX in order to unbreak building Tor Browser with
tor-browser-build, see: https://lists.torproject.org/pipermail/tor-dev/2018-July/013357.html.
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information