Customizing Firefox

gistfile1.txt

Changing Icon:
Create folder named chrome in firefox profile directory, create file inside chrome called userChrome.css, add the following lines for the icons you want to change.

#home-button{

list-style-image: url("skype.png") !important;
}

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Change grey to black:

toolbox,
#toolbar-menubar,
#nav-bar,
#PersonalToolbar,
#FindToolbar,
tabbox,
tabbar,
sidebarheader,
#sidebar-box,
window statusbarpanel {
  -moz-appearance: none !important;
 
  background-color: #000000 !important;
}