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Firefox specific port
How can I allow a specific port? I am trying to get to a specific port and Firefox blocks the access, https://x.x.x.x:xxxxx. This is the 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. How can I allow a specific port?
Chosen solution
Does the address contain an unusual port number, after a colon, such as:
example.com:9876
You can create a preference using about:config and allow the port number which Firefox is blocking. Here's how:
(0) Select and copy the following preference name network.security.ports.banned.override
(1) In a new tab, type or paste about:config in the address bar and press Enter/Return. Click the button promising to be careful.
(2) In the search box above the list, type or paste ports and pause while the list is filtered
If the above-listed preference exists:
(3) Double-click it and add a comma to the end of the list followed by the port number you need to allow. No spaces. Then click OK.
If the above-listed preference does not exist:
(4) right-click anywhere on the page and choose New > String
(5) In the preference name dialog, paste the name you coped and click OK
(6) In the preference value dialog, type in the port number you need to allow, then click OK.