[rho4]

I still find it very confusing that the active tab does not 'extend' to the content, but is separated by a shadow. I often mistake the inactive tab for the active one, because it's background is almost closer to the content.

[jackbrookes]

Agree, if anyone knows themes that make this better I'd love to know

[AndroidKitKat]

Highly suggest checking out Firefox-UI-Fix [1]. I use it everywhere I use Firefox, and it makes the browser usable.

[1] - https://github.com/black7375/Firefox-UI-Fix