As I check the author concern, I believe that it could be done by customization however it is quite customization. I can only share your a thread that you could help you. The thread below shows what file to edit however it is not that similar thread.
In regards to the tab text you can add this code in your X > Theme Options > CSS:
.x-nav-tabs > li > a:hover, .x-nav-tabs > li > a{
color:#000;
font-weight:bold;
}