YOU SAID:
You'll want not believe your eyes, if a billion fireflys!!
INTO JAPANESE
あなたの目を信じていない場合は億蛍します!
BACK INTO ENGLISH
The 100 million Firefox if you do not believe your eyes!
INTO JAPANESE
あなたの目を信じていない場合 1 億 Firefox!
BACK INTO ENGLISH
If you do not believe your eyes 100 million Firefox!
INTO JAPANESE
私を信じていないのですね
BACK INTO ENGLISH
you do not believe me
INTO JAPANESE
私を信じていないのですね
BACK INTO ENGLISH
you do not believe me
That didn't even make that much sense in English.