network.cookie.leave-secure-alone

user.js

@@ -1274,6 +1274,9 @@ user_pref("dom.storageManager.enabled", false);
  * https://bugzilla.mozilla.org/show_bug.cgi?id=1213990 ***/
 user_pref("extensions.webextensions.keepStorageOnUninstall", false);
 user_pref("extensions.webextensions.keepUuidOnUninstall", false);
+/* 2708: prevent HTTP sites from setting cookies with the "secure" directive (default: true)
+ * https://developer.mozilla.org/en-US/Firefox/Releases/52#HTTP ***/
+user_pref("network.cookie.leave-secure-alone", true);
 
 /*** 2800: SHUTDOWN [SETUP] ***/
 user_pref("ghacks_user.js.parrot", "2800 syntax error: the parrot's bleedin' demised!");