How to customize the appearance of new Firefox 89?

With the new update I cannot find the button to customize the appearance of firefox in its hamburger menu.

(The old Customize Firefox page)

Is there any way to restore the old looks?

Edit: Setting browser.uidensity to 1 partially solves the issue. But I still cannot find the old option to customize the appearance.

In about:addons > Themes
To keep the System theme you simply select it from the Options:

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That’s just the theme. Where are the settings for toolbars and density?
Have a look at the previous screenshot I posted.

Found it. It is in the overflow menu.


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