Dear Monica, you have access to this forum, so you have brought up this issue for discussion and advice from other members, which is very good. I am very sure that the other workers in the company are also in some form of discussion, maybe with each other. As HR, you are supposed to be their guide and mentor, especially in such difficult circumstances. So, firstly, abandon the thought of quitting. That would be an act of cowardice. So what if you are a woman? You have the same rights as a man and so the same responsibilities!
It has been suggested that there are many people who will take up your job and, in all probability, the BOSS will select someone of his choice who will execute his dictates with a vengeance. You are sensitive to the situation, so take charge and get the workers behind you. Not for any violent measures, for that would only vitiate the atmosphere further.
I would suggest that first, you have the fired employee file a case with the labor department. They are a nuisance when all is well, so I see no reason why they can't be a nuisance when all is not well. Use them as a tool for lawful vengeance as well as correction. Meanwhile, you could involve the production head to discreetly arrange a slowdown in production while remaining within the bounds of discipline. In this manner, each worker would feel empathy and part of the action. And you would have maintained unity, discipline, and would ultimately be able to hurt the owner and teach him the lesson of propriety which he obviously lacks.
Here's wishing you good luck.
Regards, Colonel Gahlot 'TRURECRUIT'