HTTPS Everywhere works with Conkeror. From version 1.0.0 on, Conkeror support is built-in. In earlier versions, it is necessary to edit install.rdf.

If desired, add the following command to your rc file to open a preferences dialog box for HTTPS Everywhere:

if ('@eff.org/https-everywhere;1' in Cc) {
    interactive("https-everywhere-options-dialog",
                "Open the HTTPS Everywhere options dialog.",
                function (I) {
                    window_watcher.openWindow(
                        null, "chrome://https-everywhere/content/preferences.xul",
                        "", "chrome,titlebar,toolbar,centerscreen,resizable", null);
                });
}