Firefox is the browser that the world loves to love. But there is a lot of confusion regarding its spelling and abbreviation. I have seen a lot of people abbreviating Firefox as FF or even writing Firefox as FireFox.
Mozilla had done their bit to clarify the matter as far back as 2005. From their FAQ :
How do I capitalize Firefox? How do I abbreviate it?
Only the first letter is capitalized (so it’s Firefox, not FireFox.) The preferred abbreviation is “Fx” or “fx”.
There you have it! Even I was unaware of this. Credit for correcting me goes to my friend [deXter]. And now you also know.