firefox and ipv6 http server on localhost

I'm currently playing around with the haskell yesod web framework. It uses a webserver which by default only utilizes IPV6. While I understand the problems with deploying this on the WAN presently, localhost debugging connections should not be an issue. Chrome is able to connect to this server locally, but I can't figure out how to make Firefox do so.

Does anyone know how to get Firefox to talk to a localhost server via TCP6? The port for Firefox does not have any IPv6 options.
 
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