Since above, I also installed an SSL certificate on the CDN and updated some old references in LESS/CSS files ... so we should now be 100% HTTPS secure. A padlock on the top and everything. (Woo-hoo!) A pain, but all your browsers should be happy now.
OK, this should be the last update. Also requiring TLS 1.2 as minimum. (Previously supported 1.0 and 1.1.) There really isn't any reason for using those old protocols anymore anyway. Your browser already supports 1.2. So we should be good.