I found this when opening the forum in Firefox Console.

Yea I seen this the other day when I was poking around in GOG's stuff... I love how they put come work for us in there.

Yepp, it's a very old easter-egg in the site, meant to give a heads-up to people who at least know how to look in the JS logs that GOG is hiring web coders.

And I bet those 20 characters between the first and second legs of the 'm' were a gift code for the first to discover it. :P

I discovered it a year or two ago and posted it in the forums as I already owned the game, but someone else registered the code. If memory serves correct it was for one of the Worms games.