Several scripts will need to change, but people can respond to the pop up and resend the form data until they are changed ;-)
Exciting!
Just a heads up -- there are a handful of images that are served over HTTP still (I see a bunch of offenders in the main-rollup and forumhome-rollup CSS files), and there are a few references to https:// pages in the header and footer (wiki doesn't seem to be HTTPS-ified yet, but there's still a link to https://ci.kolmafia.us as well as https://kolmafia.us).
Hello Fewyn! I would like to request that the forum software not convert all http links to https, because in the case that it's a link to an external site (including our own KoL Coldfront Wiki) the link will no longer work correctly. Thanks!