Today I have faced the new firefox update and the visual look of my firefox have changed. Below I attached a picture with green and red lines. 1. My top bar(red line) now is solid white, before it was transparent and showed what is going behind on the desktop. 2.I tried getting some custom themes but they aren't work for me, some pieces change the color etc, like I showed in the screenshot(green line) it simply gets the color of the theme, I don't like it.

So my question is: how do I make my firefox look like in the previous version? I just want the top bar to get transperent and that's it. p.s Yes, I use "system theme" right now, but it's still solid white.