This is a set of rules informing the browser addon 'HTTPS Everywhere' how to rewrite GOG.com URLs.
HTTPS Everywhere is available officially for Firefox, Chrome, Opera (modern, not 12), and Android. https://www.eff.org/https-everywhere
And unofficially for Internet Explorer and Safari. https://www.zscaler.com/httpseverywhere_ie.php https://www.altamiracorp.com/blog/employee-posts/lessons-learned-building-an-ht
Locate your Firefox/Iceweasel/Pale Moon profile directory, within which you should find HTTPSEverywhereUserRules (provided you have the aforementioned add-on installed), place Gog.com.xml in there and restart the browser.