Current Issue:
Changing network.proxy.http value in Tor Browser about:config will break the connection to onion hidden services URLs (dunno if there is a way to make this work from within TB)
Solutions: (But not really)
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Usage of extensions like foxyproxy can solve the issue but is not real solution here as it will change TB fingerprint and put a trust into external extension… harm more than benefit.
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Privoxy or tinyproxy usage within Tor Browser in Whonix cant be done because
about:preferences#connectiondoesnt exist in TB within whonix which has an option to modify connection of Tor to certain proxy IP and Port (maybe easy solvable through other ways?). -
I2P default outproxies in HTTP tunnel support onion connections, meaning you can surf the onion hidden services from I2P tunnels but the problem you will loose all the security benefits/design of Tor within whonix and shift the trust to the outproxy operator.
@eyedeekay said there is a way to make this working, hope he can be able to share it with us.