The problem may be that Firefox doesn't trust the certificate of the Printer Client Software.
To fix this issue, manually add the cert into Firefox:
1. In Firefox, go to Settings - Privacy & Security - Certificates
2. Click View Certificates - Authorities - Import
3. The Certificate is located in:
C:\Users\USERNAME\AppData\Local\.neodynamic\jspm\ca (Windows)
C:\Users\USERNAME\.neodynamic\jspm\ca (Windows)
~/.neodynamic/jspm/ca (Mac)
4. CHECK "Trust this CA to identify websites" and click OK.
After this go to Settings - Printer and try to select the printer and print a test page.
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