How to hide owned products on gog:
In firefox:
1) press ALT > view > toolbars > bookmarks toolbar (CHECKED)
2) RIGHT click bookmarks toolbar > new bookmark
3) Name it what you like (GOG_hide_owned) and put this into location:
javascript:( function(){ var css = '.is-owned { display: none; }', head = document.head || document.getElementsByTagName('head')[0], style = document.createElement('style'); style.type = 'text/css'; if (style.styleSheet){ style.styleSheet.cssText = css; } else { style.appendChild(document.createTextNode(css)); } head.appendChild(style); })()

After all products loaded (use load more products button before applying the next step) just press the GOG_hide_owned button in the bookmarks toolbar and you see only products that you do not own

Thank you for posting this! That's a nice way to do it without external tools.

Another alternative is to get the Stylus browser extension for Chrome ( here ) or Firefox ( here ) and once installed, install one of the following styles:

This one hides owned games completely so they don't even show up:
Hide Owned GOG (No Display)

This one just darkens owned games so they still show up but are barely visible:
Hide Owned GOG (Darken)


To be honest though, this feature should really be a part of the site. It wouldn't take much to implement a filter for it.