Some suggestions about the Breath GTK theme

There’s an empty strip in the title bar (right above the tab bar) because the button box is too high:

The scroll bar is too big:

Check boxes are too big, and not aligned with their labels:
Temp (3)

Can we do anything about this, since Breath is mantained by Manjaro?
I’ll add any other ‘issue’ in the comments (and I hope you’ll do the same)

I don’t know what can be done about this, but the resize icon is a bit too flashy depending on the background color (bottom right corner):

The best option would be to change that white layer with a transparent one, not sure if Firefox supports transparent elements though.