Question: is there anything wrong or bidah to greet on jumma saying ’jummah Mubarak’?

Answer:
There is nothing wrong, but it has not been the practice of our Akaabir and not of the salaf. Eid Mubarak is ok as it’s once in a while. Many Salaf even refrained from that thinking it can only be Mubarak if Allah Ta’ala accepted our Ramadan and forgave our mistakes, otherwise it’s not Mubarak.