FF

Translingual

Symbol

FF

1. French franc(s)
2. Mozilla Firefox, the internet browser

English

Initialism

FF

1. Fast forward
2. Form feed (printing character, ASCII decimal value 12.)
3. Fianna Fáil an Irish political party.
4. Fully finished
5. (vulgar, slang) Fist-fucking
6. (video games) Final Fantasy (at Wikipedia)
7. Family First an Australian political party.

Abbreviation

FF

1. frigate, a type of warship