Remove the black corners from Firefox's Nova design when maximised

[IulianArian]

Firefox Nightly (Nova)

Firefox (without Nova)

I have the a habit going fast with my mouse to the "X" to close my browser. But with the new Nova redesign, I can no longer do that. All I want if possible is a option in settings to disable the black outline of the browser or to only make it show when it is a window on the desktop.
Firefox

[Jon]

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[Katz]

I moved the new tab button on the top left corner and im having the same issue, also it's very frustrating that i cant click the very top of a tab since there is a small blank area above it.

[Katz]

I moved the new tab button on the top left corner of my browser and I'm having the same issue, also its really frustrating that i cant click on a tab if I am  at the very top of it since there is a blank area now.

[tombayo]

I'm having the same experience; really frustrating to change tabs, as my habit is just to move the cursor to the top of the screen to switch (avoiding straining accuracy of the mouse).

Also scrolling on a webpage now requires the cursor to NOT be all the way on the left edge of the screen, since the window has a small border there. 

I found this setting to slightly help, but there is still a border all the way around a maximized window.

I wish there was another option here to just remove the border altogether.