Hi, it is my first post here. I was wondering how does GOG Galaxy 2.0 launch Steam? I would like to open it every time with -no-browser option. Is it something I can do or is it done by Steam games themselves when they are launched and thus not possible to change?

What do you mean?
GOG can't run the game itself if you bought it from steam, what it does is "make" steam launch the game, thus you need to have steam on

That's exactly what I meant. GOG is probably launching steam game with "steam.exe -applaunch <appID> [launch parameters]" as in here. So what I am asking is how can I specify launch parameters so I can include "-no-browser" there.

Overall goal is having GOG to launch Steam without browser engine on so I can save resources and use only GOG as launcher and library manager.
One thing that comes to my mind is to have Steam launch on login with this option, but it is not a solution because I don't use Steam every time I log in to my PC.

Hope I clarified what my question/problem is.

I would actually love to have that
for some games that do not have windowless fullscreen

and im not sure gog can do that yet