“wcmapiconfig.properties file not found” error when launching Process Designer or other Process Java applets in FileNet Business Process Manager Workplace XT

Error encountered:
When using Firefox 24, starting the Process Configuration Console requires authentication. When the credentials are entered, it says that it cannot access wcmapiconfig.properties file. However, this works fine when IE 10 is used. Documentation says that Firefix 24 is not supported. But still, there must be some misconfiguration that I did. 

Please feel free to comment if you know the exact problem. 🙂