2 things concerning the admin bar

Hi,

1) I have developed a little plugin that shows quotes in the admin bar. The idea is : The quote is showing on the right side of the bar, and when your mouse goes on it, a submenu shows (with only plain text) with infos about the quote (author, year, etc…).
I have a problem with Firefox : this is the only navigator on which, when the submenu (background color : white) shows, the menu goes white too.
If you don’t understand well, here are pics :
Chrome : http://puu.sh/JOlq
Firefox : http://puu.sh/JOnU

I think this comes from the CSS, even if I never changed it…

2) I want to change the color of the admin bar. I tried a few plugins to do that but it only changes the color in the admin page, not on the entire website. Where should I change the CSS to change completely the color ?

[No bumping, thank you.]