Firefox: This address is restricted

This address uses a network port which is normally used for purposes other than Web browsing. Firefox has canceled the request for your protection.

This message appears if you want to access a website on a non-standard port, e.g. .

Being a developer you might run in your non-productive environment a web server listening on such a port. As a workaround you can tweak your firefox by adding the configuration to your preferences.

To do so go to about:config, click on the “I’ll be careful, I promise!” button and right-click any preference. In the appearing context menu click New > String and add the new preference

with a value “1-65000″ or whatever ports you want to access. They don’t describe blocked ports but ports that are considered to be not banned.

I recommend to create a new firefox profile for development and testing purpose and that you only open ports that you really need.


  1. Hello,

    Thanks for this post. It was a big help.

    I published this help in Portuguese in: Firefox – Endereço Restrito

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