I don’t know, whether it has been discussed in the past, but it seems like tor-browser-bundle-bin always fails to build whenever a new version comes out. Apparently, that’s because upstream does not keep old versions on their mirrors and caching is disabled in nixpkgs for this package. We cannot do anything about the former, but I have some questions about the latter.
First of all, what are the reasons behind this decision? Are they documented somewhere to keep the community informed? If we need to have package for tor browser with caching disabled, can we have another one with it enabled?
Personally I don’t include Tor browser in my config because it would make it too fragile.