True Launch Bar v6.6.5 beta

Yuri, I am sorry I made a mistake. I meant IP add "Real IP" plugin, NOT uptime plugin.

For the "Real IP" plugin the standard way is working: Right click plugin, select Appearance->Text Color and clic one of the predefined colors or "More colors..." to select any other color.

Also you can select the default text color for toolbar:
TLB Settings->Toolbar->Colors and Font
for menus:
TLB Settings->Menu->Colors