Browser qualification tests for Firefox 43 Rapid Release Cycle were completed by the Suite Test Center for S/4HANA Project Services Edition 1603.
The tests were done for the following areas: Procurement of Direct products, FIN and Project based services for the operating systems Windows 10, 8.1, 7.
For restrictions and limitations see Firefox browser note https://service.sap.com/sap/support/notes/990034.