Config window can grow too long for the screen

[Jolar]

On my small netbook with a 1024x600 screen, the config window can grow so long it's impossible to use it - it extends way below the bottom end of the screen and there's no way to scroll down. Using Windows 10 and Firefox.

("Something went really wrong, and we can’t process that file." when trying to attach a png or jpg screenshot, see http://imgur.com/BHS6oQo instead.)