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I am getting this message "This address uses a network port which is normally used for purposes other than Web browsing. Firefox has canceled the request for your protection." I know the site it's mine so I need to access it.

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Note I also need to be able to install an active x feature.

Note I also need to be able to install an active x feature.

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Reading the second reference from cor-el turned up about:config. One can go there and monkey with network.security.ports.banned (I'm not sure whether adding network.security.ports.banned.override is necessary; I tried both at once and something worked) to get around this blockage. To make it work, it is necessary to restart Firefox.

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Yes, when you make config changes you need to restart Firefox so those changes can take effect.