A: Respected Brother/Sister in Islam
As Salaamu Alaykum wa Rahmatullahi Wa Barakaatuh
Haamidaw wa Musalliyaa
Your query below refers;
Saying “Jumuah Mubarak” is not a Sunnah or practice and is not found from among the noble practices of the our pious scholars of the past.
However, greeting someone with the words “Jumuah Mubarak” on a Friday is permissible considering that it is a form of dua for one to be blessed on the day of Jumuah. The condition is this practice should not be regarded as a Sunnah nor something that is compulsory on a Friday. Also, it should not be such that this greeting replaces the Sunnah greeting of salaam that has been prescribed in the Quran and Hadith.
And Allah Ta'ala Knows Best
M.D. Mangera (Mufti) and Shafique Jakhura (Mufti)