To change the default color of Firefox’s progress bar (in the status bar and the Download window), enter this code in you userChrome.css file locate in your profile folder.
/* Change the progress bar color */
-moz-appearance: none !important;
background-color: #660000 !important;
To set your favorite color, change the RGB code (#660000). For example, enter:
- #333366, for blue
- #660000, for wine
- #996600, for gold
- #FFCCCC, for pink
- #9900FF, for sky blue
- #006600, for green
Check more RGB color codes here.