importing bookmarks to firefox

hello, ive created a new screename on my PC and i was wondering where the file is for my previous screenames firefox's bookmarks so i can import them to this screename

thanks in advance

FUCKING STOP BRINGING UP OPERA WHEN PEOPLE ASK A FIREFOX QUESTION!!!! THEY DID NOT ASK ABOUT OPERA!
If they wanted to know about it, they would have asked.

And stop using that shitty site. It is full of lies and quotes taken out of context.
You use Opera, good for you. Use it.
And in turn, I will use what I want.

Now fuck off.