Add support for Nano Adblocker UI

[Gl4nza]

Hi, Now Nano Adblocker is out on FF would it be possible for you to add the same support as you have previously for Ublock Origin?

https://addons.mozilla.org/en-US/firefox/addon/nano-adblocker-firefox/

Nano currently has the default white background like UBO had before you skinned it.

Thanks.

[Pat Johnson]

Are there any UI differences between Nano and uBO? If not I can add it, otherwise it might not be a great candidate for me to style right away

[Gl4nza]

The settings / filters menus are all the same, the big difference is when clicking on the addon itself, Nano uses a different menu layout than Ublock Origin.