Help:Extension:SecureLinkFixer
The SecureLinkFixer extension automatically rewrites some URLs to use HTTPS.
Which domains?
editThe domain list comes from Mozilla's HSTS preload list. Websites can submit themselves to be added. You can see the list of domains in Gerrit (warning: large page).
How to add a new domain?
editWebsite operators can submit themselves to be added to the HSTS preload list.