The previous version of FoxyProxy would allow you to proxy *.localhost domain names which makes it possible to remap some *.localhost domain names to :

• another localhost port i.e. "http://myapp.localhost/ → http://127.0.0.1:9001".
• Unix-domain-socket services i.e. "http://myapp.localhost/ → /run/user/${pid}/app.sock".

Using *.localhost in this case is arguably semantically correct (as it is a local service) and currently makes it possible to host your HTTP service as a trusted context on Firefox.

However, this is not possible in the new version of the extension as it applies a global bypass for *.localhost which makes it impossible. While it is quite reasonable to have this protection by default, would it make sense to have an option to disable it ? (globally? per proxy?)

Caveats:

• would only work on Firefox (I think);
• might even not work on Firefox in the future.