Firefox Quantum - I want to access restricted port but `network.security.ports.banned.override` does not work?

Firefox Quantum - I want to access restricted port but network.security.ports.banned.override does not seem to work.

How can I connect to http://localhost:4045 ?

Solution 1:

You can add this as String.

Go to the address field (where you type www.google.com) and type about:config.

Now right click on the list and select New > String.

Give it a name, in this case network.security.ports.banned.override, and enter the port, port range, or comma-separated ports. To allow all ports, simply type 1-65535 as the value. To allow just a few ports, enter 87,88,89,1050 etc.

Firefox 57 doesn't contain network.security.ports.banned.override by default, but you can still add it manually.