Johny.: ... then enable checkbox "Cascade top document's permissions to 3rd party scripts"...
Nevertheless, in my opinion it was a bad move to include scripts from 3rd party domains in the first place.
At first the crappy Google captcha and now a dubious cloudfront.net script. Don't blame users for best practise not allowing all scripts, but start to do the same. It's also not very comforting to tell us, that it's "HTTP only" by the way.
And since we're already talking about security and best practise, GOG's login is far from it. Giving the user direct feedback about the correctness of the entered e-mail is very bad design. The "User not found" message is almost made for abuse. Via try and error, one could verify actual e-mail addresses of GOG users! (even with the captcha)
Why don't you just say wrong data, when either the password or the e-mail address is wrong. It would solve the issue immediately and is common standard.