Weird link when trying to go to admin panel in firefox

i tried to click to the admin panel to edit one of my custom html blocks, and this was the link it tried to redirect to instead...

http://www.xn--=wwwwossz%c2%9d5%c2%9d-y4a17kra7qxd4c.com/

i could get to it from chrome, but i thought that was seriously weird and needed reporting

Hello

Could you please provide more information like:
- The url of your forum
- A screenshot of the problem

Thanks in advance
Regards