And now my address bar expands on click, because browser.urlbar.update1 was removed from about:config. I knew this day was coming, but I'm still not happy it's here.

The movement is distracting, and the alignment of the bar's expanded state is terrible. There's a reason most graphic design follows a grid system.

We need a way to turn this off. I realize the old about:config flag was tied to a legacy code pathway, but now Mozilla should implement a new flag. I don't think that's an unreasonable ask.

https://github.com/Aris-t2/CustomCSSforFx might be of interest for you.