• graphial worker does not work well with my browser

 

I would like to give some feedback about ...

From: https://py.checkio.org/mission/open-labyrinth/solve/

HTTP_USER_AGENT:

Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:49.0) Gecko/20100101 Firefox/49.0

Check with Firefox, the arrow does not move properly.