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Firefox 57, how to change color of active tab?

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Hello, I'm using the Colorfun Rainbow theme in firefox 57. I'd like to change the color of the active tab to red. I've tried the following code in userChrome.css:

/* Active tab */

   tab[selected=”true”] {
   color: red !important;
   font-weight:bold
   }
   tab {
   -moz-appearance: none !important;
   }

After saving, and restarting Firefox, there is no change to the active tab color. What am I missing?

Hello, I'm using the Colorfun Rainbow theme in firefox 57. I'd like to change the color of the active tab to red. I've tried the following code in userChrome.css: /* Active tab */ tab[selected=”true”] { color: red !important; font-weight:bold } tab { -moz-appearance: none !important; } After saving, and restarting Firefox, there is no change to the active tab color. What am I missing?