When loading TeX.SX over TLS (e.g. Force equal hinting when combining symbols) with HTTPS Everywhere, images are not displayed.

Firefox shows this error (e.g. for https://i.sstatic.net/k1rDN.png):

An error occurred during a connection to i.stack.imgur.com. Peer reports it experienced an internal error. (Error code: ssl_error_internal_error_alert)