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Allow Firefox to Access Non-Standard Ports -
Problem: Firefox blocks uncommon low-numbered ports by default, which are needed by some web apps I use. When I try to go to http://whatever:95, for example, I get an error message saying “Access to this port has been disabled for security reasons”.
After some googling, I found the solution.

Solution: Open Firefox, and an the address bar, type about:config and hit enter. It will bring up a registry-style configuration editor. Right-click anywhere on the config and select New -> String. It will pop up a dialog box asking your for the name. Type network.security.ports.banned.override then hit enter. Then, when asked for the value, type the port numbers you wish to access, separated by commas, eg. 95,113 and hit enter again. You should see that a value like this has been entered:

screenshot

You can now access applications on these ports!
-Jonesy