Why wont Mozilla Firefox not support third party fonts on my Website?

I have a TTF (True Type Font) which I have used correctly, as it shows up in Safari and Chrome. Is there a way to enable third party fonts on Firefox, or a MAC friendly file extension which is universal across all internet browsers?

I read up about it, and people suggested WOFF files, but they are an executable file on MAC, and Font Book wont open these files. I'm not particularly interested in downloading a third party program to install this third party font.

(In case you are wondering, or it helps, the font is "Top Secret". It's like an ARMY font)