u/Spacecpp

Before updating firefox the tab had bright color, now it became completely transparent with just a thin outline.

I'm using the following css to style my tabs: https://github.com/Aris-t2/CustomCSSforFx/blob/master/current/css/tabs/classic_squared_tabs.css

I had tried using the solution from a similar post, but it didn't affect the selected tab at all:

.tab-background[selected] { background: #e67e22 !important }