I nearly stopped using it with the terrible color changes to the tabs (no contrast) in v92. I mean, I thought, this is finally the last straw. But I found that I could customize some colors, especially the active tab, with an add on called Firefox Color.

https://addons.mozilla.org/en-US/firefox/addon/firefox-color...

Maybe it will help someone who has the same problem.

I really miss the old and customizable Firefox.