How to change firefox background

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The inactive tabs blend into the background.Thanks to an anonymous commenter for this tip. In Firefox Color, use the Advanced Colors / Tab Selected setting. I couldn't see a way to set the color in Firefox Color. I want the active tab to be much brighter.I mostly like the new design though, but I strongly dislike some elements, especially the tabs: Firefox 89 has a new appearance, removing features (ugh) and annoying some people while delighting others.