A music player addon for firefox in the actual menu

[chuotbay1]

Hi all,
I see a lot of possibilities with the all new firefox menu.
I recentlly got a music player addon for firefox in the actual menu which saves me a lot of space from other toolbars.
Now I have a question: how to ONLY show icons in the menu bar and change the padding?
I guess it's in the chrome file, however can someone point me towards the right direction?
I didn't find anything on google since the new menu has only been around
Thanks

[therube]

What version of FF?
What is this "all new firefox menu"?
Which music player addon?