From Firefox Help: Tips & Tricks:
Make the active tab easier to distinguish
In order to make the active tab easier to distinguish among the currently opened tabs,
you can also change the colors for the tabs. Add the following code to your userChrome.css file:
/* Change color of active tab */
tab{
-moz-appearance: none !important;
}
tab[selected="true"] {
background-color: rgb(222,218,210) !important;
color: black !important;
}
/* Change color of normal tabs */
tab:not([selected="true"]) {
background-color: rgb(200,196,188) !important;
color: gray !important;
}
Don't use bold text on the active tab
If you don't want the title of the active tab to be bold, add the following code to your userChrome.css file:
/* Make the active tab not bold */
tab[selected="true"] {
font-weight: normal !important;
}
Remove the close button from the tab bar
You can remove the close button from the tab bar by adding the following code to your userChrome.css file:
/* Remove the close button on the tab bar */
.tabs-closebutton {
display: none !important;
}
You can still close tabs by right clicking on them and select Close Tab, or by pressing Ctrl W
PS : Thank you, Qhitch.
Blog this! is wonderful.