This is how everyone else's screenshots look here:
This is how it looks for me:
I have tested it on the latest Firefox on Windows 10, the latest Firefox on Ubuntu 18.04, and on an extremely old version of Firefox (52.02). The result is the same for all of them.
It also does not look right; the coloured links and normal text don't fit in with the rest. The look in the other user's shots looks more like an intended design.