Thanks, just adding .tabbrowser-tab[selected] { background: #fcb731 ! important; } Already makes the active tab visibility so much clearer.

Thanks, just adding .tabbrowser-tab[selected] { background: #fcb731 ! important; } Already makes the active tab visibility so much clearer. I just did a check, they use #FFFFFF for active tab and #F0F0F0 for non active tab. Using https://webaim.org/resources/contrastchecker/ https://webaim.org/resources/contrastchecker/ Gives a contrast ratio of 1.13:1 A big fat fail