The video, filmed to advertise the town's traditional bal des pompiers on August 15, spread rapidly on Instagram within hours of being posted.
The suspect, already known to territorial intelligence services though not flagged as an active threat, was arrested Sunday and placed in custody for glorifying terrorism after sending emails referencing the Islamic State to mayor David Lisnard's office and the Grasse courthouse.
Parlons Ensemble, a lay association run entirely by volunteers, welcomes relatives of inmates at the maison d'arrêt into a small room just outside the prison gates, offering a listening ear and practical help before visiting hours.
The perfume capital's signature summer festival returns Friday to Sunday, marking eight decades of celebrating the jasmine flower with a flower parade, live music and fireworks.
The perfume house founded in 1926 is still run by its founder's great-granddaughters, who say the business is very much a family affair.